Category Archives: Challengers

Westerhof, Van Der Duim, and a Strong Whiff of Match Fixing

This afternoon at the ATP Meerbusch Challenger in Germany, all eyes were definitely not on a first-round match between Dutchmen Boy Westerhof and Antal Van Der Duim. Both are ranked outside the top 250, neither has ever cracked the top 200, and both are in their late twenties.

It appears that the two players assumed no one would be watching. Before the match, the markets on Betfair were very suspicious:

For those of you not accustomed to parsing betting markets, here’s a summary of what the market thought was going to happen:

  • Van Der Duim’s chances of winning the match were between 75% and 80%.
  • Van Der Duim’s odds of winning the first set were roughly 35%.
  • There was a better than 50/50 chance that Van Der Duim would win the match in three sets. The odds of any other specific outcome (e.g. Westerhof wins in three) were minuscule in comparison.

The match odds in themselves might have raised a few eyebrows, but could be written off as owing to Westerhof’s recent run of poor play, or perhaps some information gathered on site about a nagging injury. When combined with the other markets, however, it’s clear that something very fishy was going on.

The match went precisely according to script. After Westerhof took the first set, 6-4, the market got more and more confident about Van Der Duim winning the second set:

Van Der Duim remained the favorite even after going down an early break in the second set. Shortly thereafter, with no cameras watching, Westerhof seems to have decided not to waste any more time:

https://twitter.com/baselinebetting/status/498823405282807809

In the end, Van Der Duim beat Westerhof, 4-6 6-3 6-3. No one following the betting markets was at all surprised.

Nor should we be shocked that this sort of thing happens. With the middling prize money on offer at Challenger events–Westerhof will get about $500, and if Van Der Duim loses in the next round, he’ll be awarded about $800–there’s more money to be made by losing matches than winning them.

While we don’t know how often matches are fixed, something was very wrong about this one. Because the markets so blatantly telegraphed the fix, it poses an important question to the sport’s governing bodies. If they don’t take this opportunity to act, it will send a very clear message to Challenger-level players that match-fixing is acceptable practice.

(Thanks to the three Twitter users quoted above, who brought this match to my attention.)

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Filed under Betting, Challengers, Match Fixing

Nick Kyrgios and the First Fifty Matches

When Nick Kyrgios lost the Wimbledon quarterfinal to Milos Raonic yesterday, he was playing his 50th career match at the Challenger level or above. Round numbers invite big-picture analysis, so let’s see how Kyrgios stacks up to the competition at this early milestone.

When Monday’s rankings are released, Nick will debut in the top 100, all way up to #66. Only Rafael Nadal (61), Gael Monfils (65), and Lleyton Hewitt (65) have been ranked higher at the time of their 51th Challenger-or-higher match.  Roger Federer was #93, Novak Djokovic was #128, and Jo Wilfried Tsonga was #314. Of the current top 100, only ten players reached a double-digit ranking by their 51st match.

The wealth of ranking points available at Grand Slams have played a big part in Kyrgios’s rise, but they don’t tell the whole story. He has won 36 of his first 50 matches, equal to the best of today’s top 100. Nadal went 36-14, and next on the list is Djokovic and Santiago Giraldo (who played almost all Challengers) at 34-16. Most of Nick’s wins before this week came at Challengers, and he has won four titles at the level.

No other active player won four Challenger titles in his first 50 matches. Eight others, including Djokovic, Tsonga, Stanislas Wawrinka, and David Ferrer, won three. All of them needed more events at the level to win three titles than Kyrgios did to win four.

Nick’s short Challenger career is another indicator of a bright future. He has only played nine Challenger events, and with his ranking in the 60s, he may never have to play one again. As I’ve previously written, the best players tend to race through this level: Federer, Nadal, and Djokovic all played between eight and twelve Challengers. It’s a rare prospect that makes the jump in fewer than 20 events, and when I researched that post two years ago, more than half of the top 100 had played at least 50 Challengers.

One category in which the Australian doesn’t particularly stand out is age. When he plays his 51st match, he’ll a couple of months past his 19th birthday. Roughly one-quarter of the current top 100 reached that match total at an earlier age. Nadal, Richard Gasquet, and Juan Martin del Potro did so before their 18th birthday, while Djokovic, Hewitt, and Bernard Tomic needed only a few more weeks beyond that.

Without knowing how Kyrgios would’ve performed on tour a year or two earlier, it’s tough to draw any conclusions. His 36-14 record at 19 certainly isn’t as impressive as Rafa’s equivalent record at 17.

Cracking the top 100 at 17 or 18 is a much better predictor of future greatness than doing so at 19, but as the tour ages, 19 may be the new 16. Grigor Dimitrov didn’t enter the top 100 until he was three months short of his 20th birthday, while Dominic Thiem and Jiri Vesely were still outside the top 100 on their 20th birthdays. Among his immediate cohort, Kyrgios stands alone: No other teenager is ranked within the top 240.

As predictive measures go, Nick’s Wimbledon performance–built on his poise under pressure–is the best sign of them all. Only seven active players have reached a Grand Slam quarterfinal as a teenager, and four of them–Fed, Rafa, Novak, and Lleyton–went on to reach #1. (The other three are Delpo, Tomic, and Ernests Gulbis.)

For a player with only fifty matches under his belt, that’s excellent company.

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Filed under Aging trends, Challengers, Nick Kyrgios, Wimbledon

Margin of Error Podcast: Episode Two

This week’s podcast is ready for listening!

Amy’s and my guest for Episode Two is JJ of Challenger Tennis — read his blog here and follow him on twitter here.  We chat with him about how he got interested in the lower tiers of the pro game, the struggles of life on the Challenger tour, and some players to watch outside of the usual suspects.  Thanks, JJ, for joining us.

You can find the podcast and subscribe with iTunes here. Otherwise, keep an eye out for a new episode early each week, which I’ll post here on the blog.

Click here to listen.

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Challenger Tour Finals Forecast

I wrote an extensive preview of this week’s Challenger Tour Finals for The Changeover, so you should check that out first.  (Also worth a read is the preview at Foot Soldiers of Tennis.)

Because so much less separates players at this level (compared to those at last year’s World Tour Finals), my forecast stops just short of throwing its hands up in dismay.  Coming into the event, Italian clay specialist Filippo Volandri was the favorite, with a 15.5% chance of winning the event.  He lost today to Alejandro Gonzalez, making it much less likely that he’ll progress out of the round-robin stage.

Today’s other winners were top seed Teymuraz Gabashvili, Oleksandr Nedovyesov, and Jesse Huta Galung.  My numbers now consider Huta Galung the favorite, with a better than 20% chance of winning the title.  The situation in Grupo Verde will become much more clear after tomorrow’s night match between Gabashvili and Nedovyesov.

Here is the pre-tournament forecast:

Player       3-0  2-1  1-2  0-3     SF      F      W  
Gabashvili   12%  38%  37%  13%  49.8%  24.3%  12.0%  
Volandri     15%  40%  35%  10%  55.3%  29.3%  15.5%  
Nedovyesov   14%  39%  36%  11%  53.0%  26.9%  13.7%  
Huta Galung  14%  39%  36%  11%  53.8%  28.2%  14.6%  
Gonzalez     10%  35%  40%  15%  45.0%  21.8%  10.4%  
Ungur        10%  35%  40%  15%  45.0%  20.9%   9.8%  
Martin       11%  36%  39%  14%  46.0%  22.4%  10.7%  
Clezar       13%  38%  37%  11%  52.2%  26.3%  13.3%

And here is the forecast updated with the results of today’s four matches:

Player       3-0  2-1  1-2  0-3     SF      F      W  
Gabashvili   24%  50%  26%   0%  71.5%  35.0%  17.1%  
Volandri      0%  27%  50%  23%  30.2%  16.2%   8.6%  
Nedovyesov   28%  50%  22%   0%  75.7%  38.3%  19.5%  
Huta Galung  27%  50%  23%   0%  74.7%  39.0%  20.5%  
Gonzalez     23%  50%  27%   0%  70.1%  33.7%  15.8%  
Ungur         0%  22%  50%  29%  23.1%  10.8%   5.1%  
Martin        0%  23%  50%  27%  25.1%  12.2%   5.9%  
Clezar        0%  27%  50%  23%  29.6%  14.9%   7.4%

(My algorithm doesn’t implement the details of the number-of-sets-won tiebreaker, so Guilherme Clezar, the only loser today to win a set, probably has a slightly better chance of advancing than these numbers give him credit for.)

Challenger charting: The most interesting match of the day–if not the cleanest–was the last one, between Nedovyesov and Clezar.  I charted it, so you can check out detailed serve, return, and shot-by-shot stats for that contest.

And if you’re really into this stuff–Challengers and/or charting–here are my stat reports from yesterday’s first-round matches in Champaign between Ram and Giron and Sandgren and Peliwo.

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Yen Hsun Lu’s Challenger Choices

Yen Hsun Lu has played in a lot of tournaments with fields that look like this month’s Leon and Guadalajara Challengers.  Ranked in the bottom half of the top 100, he is often the only top-100 player in the draw.  In fact, he has been the top seed in every Challenger he’s played for more than a year.

Top seeded or not, Lu seems to really like Challengers.  When other players at his level are contesting ATP 250s or Masters-level qualifying draws, the Taiwanese #1 is demonstrating his dominance of the minor leagues.  And it’s working: In large part thanks to titles in places such as Shanghai, Ningbo, Seoul, and Singapore, he has kept his ranking in the top 100 for about three years.

Lu’s combination of consistency near the top and Challenger preference is unusual but not unique.  He is one of 14 players who, since 2007, have played at least 20 Challenger events while ranked inside the top 100.  He is, however, the most extreme member of the group. This week’s Guadalajara event will be his 40th Challenger as a member of the top 100.  Dudi Sela, also in Guadalajara but currently outside the top 100, has played 31 while part of that more elite club.

Almost every week of the season, there is some tour-level event, and usually, anyone in the top 100 would make the cut for qualifying, if not necessarily the main draw.  But for Lu, the ATP option isn’t always so inviting.  He hates clay, with only two career wins on the surface, one of which was twelve years ago in a Davis Cup Group 2 tie against Pakistan.  (No, not against Qureshi. He lost to Qureshi.)  Despite five entries and a valiant effort in a fifth-set, 11-9 defeat against Jeremy Chardy last year, he has never won a match at Roland Garros.

His Challenger preferences are even more extreme: Out of 137 career events at this level, only two have come on clay.  He is the Alessio Di Mauro of hard courts.

While Sela has a longer track record (and a bit more success) on dirt, his current preferences are very similar.  Given the choice between a hard-court Challenger and anything on clay, and he’ll take the Challenger.  While there aren’t as many tour-level events on clay as Rafael Nadal might like, there are enough to keep Lu and Sela on the lower circuit for several months of the year.

Most of the other players who rack up extensive Challenger records while ranked in the top 100 have the opposite preference.  Filippo Volandri and Ruben Ramirez Hidalgo are the most extreme.  While ranked that high, each has only played three ATP qualifying events, despite entering 29 and 27 Challenger events, respectively, since 2007.  (RRH’s career figures are higher; I’m using the time span since 2007 because my qualifying database only goes back that far.)

Here’s the list of all players who have contested 20 or more Challengers while ranked in the top 100 since 2007, along with the number of ATP qualifying draws they entered while in the top 100 and the rate at which they chose Challengers out of these two options.

Player                 CHs  Qs  CH+Qs  CH/CH+Q  
Yen Hsun Lu             38  10     48      79%  
Dudi Sela               30   6     36      83%  
Filippo Volandri        29   3     32      91%  
Carlos Berlocq          29   5     34      85%  
Michael Russell         28  25     53      53%  
Ruben Ramirez Hidalgo   27   3     30      90%  
Frederico Gil           26  12     38      68%  
Daniel Gimeno Traver    26  21     47      55%  
Nicolas Mahut           22   7     29      76%  
Oscar Hernandez         22   8     30      73%  
Pere Riba               22  11     33      67%  
Tobias Kamke            22  18     40      55%  
Diego Junqueira         21   2     23      91%  
Olivier Rochus          21  11     32      66%

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National Showdowns in Challenger Finals

If Dudi Sela and Amir Weintraub both win their semifinal matches at the Leon Challenger today–against Donald Young and Jimmy Wang, respectively–it would the first time that two Israelis face off in a Challenger final, at least since the beginning of 1991, when my challenger database begins.

In over 2800 Challengers in that time span, 407 of them have ended with finals contested between countrymen.  As you might guess, all-USA finals have been the most common, at 84, partly due to the former dominance of Americans in the sport and also owing to the large number of Challengers held on US soil.  Next in line are Argentina (59) and Spain (52), two countries with the key combination of many events and a large pool of second-tier pros.

Perhaps more interesting are the countries at the bottom of list.  Nations like Slovenia*, Taiwan, and Slovakia have more in common with Israel–few events in-country, with just a handful of players contesting Challengers.  Those are the three most recent countries to join the list.  Given the contemporary Challenger field, even more surprising are inclusions such as Norway, Denmark, Mexico, and Morocco, all of which enjoyed all-national Challenger finals in the 90s.

*Slovenia is increasingly becoming a force to be reckoned with.  Led by the underrated Grega Zemlja, it is one of only 12 countries with three players in the ATP top 100.

Given that 29 countries have experienced such a final, we might expect some nations that aren’t on the list.  A few that come to mind are Switzerland (usually better represented than the current two players ranked between 20 and 300), Ukraine (currently six players between #98 and #300), and Portugal (surely Rui Machado and Frederico Gil will meet in a final eventually).

Here’s the full list, including the most recent final for each country:

Country  CH Fs  Date      Event            Winner              Runner-up                
USA      84     20130204  Dallas CH        Rhyne Williams      Robby Ginepri            
ARG      59     20120730  Manta CH         Guido Pella         Maximiliano Estevez      
ESP      52     20121112  Marbella CH      Albert Montanes     Daniel Munoz De La Nava  
GER      39     20130121  Heilbronn CH     Michael Berrer      Jan Lennard Struff       
FRA      36     20121001  Mons CH          Kenny De Schepper   Michael Llodra           
ITA      31     20110718  Orbetello CH     Filippo Volandri    Matteo Viola             
CZE      24     20120312  Sarajevo CH      Jan Hernych         Jan Mertl                
BRA      20     20120910  Cali CH          Joao Souza          Thiago Alves             
AUS      17     20130225  Sydney1 CH       Nick Kyrgios        Matt Reid                
NED      5      20100906  Alphen CH        Jesse Huta Galung   Thomas Schoorel          
BEL      4      20120924  Orleans CH       David Goffin        Ruben Bemelmans          
ROU      4      20120806  Sibiu CH         Adrian Ungur        Victor Hanescu           
AUT      4      20070716  Rimini CH        Oliver Marach       Daniel Koellerer         
COL      3      20120709  Bogota CH        Alejandro Falla     Santiago Giraldo         
JPN      3      20120423  Kaohsiung CH     Go Soeda            Tatsuma Ito              
RSA      3      20110411  Johannesburg CH  Izak Van Der Merwe  Rik De Voest             
SWE      3      19931101  Aachen CH        Jonas Bjorkman      Jan Apell                
RUS      2      20100823  Astana CH        Igor Kunitsyn       Konstantin Kravchuk      
GBR      2      20050704  Nottingham CH    Alex Bogdanovic     Mark Hilton              
CAN      2      19991129  Urbana CH        Frederic Niemeyer   Sebastien Lareau         
IND      2      19990412  New Delhi CH     Leander Paes        Mahesh Bhupathi          
SLO      1      20120716  An-Ning CH       Grega Zemlja        Aljaz Bedene             
TPE      1      20111017  Seoul CH         Yen Hsun Lu         Jimmy Wang               
SVK      1      20100809  Samarkand CH     Andrej Martin       Marek Semjan             
NOR      1      19980601  Furth CH         Christian Ruud      Jan Frode Andersen       
ECU      1      19960715  Quito CH         Pablo Campana       Luis Adrian Morejon      
DEN      1      19960226  Hamburg CH       Kenneth Carlsen     Frederik Fetterlein      
MAR      1      19950814  Geneva CH        Younes El Aynaoui   Karim Alami              
MEX      1      19920427  Acapulco CH      Leonardo Lavalle    Luis Herrera

TennisAbstract.com update: If you like ATP stats, you’ll love the new leaders page.  It allows you to compare the ATP top 50 across nearly 60 different metrics, and filter matches in all the same ways you can on player pages.  Find out who hits the most aces on  clay, who plays the most tiebreaks in Masters events, who has faced the toughest opponents, or just spend the rest of your afternoon tinkering with the thousands of possible permutations.  It’s very much a work in progress, so (a) let me know if you have suggestions or come across a bug; and (b) don’t be shocked if I occasionally break it while trying to improve it.

Also, I’ve created a “current tournaments” page that aggregates all matches (completed and upcoming) at this week’s events.  It’s a great way to get a quick overview of what’s happening this week, and with next week’s qualifying draws released, you can also use the filters to zero in on, say, all Americans who are still alive in some ATP, WTA, or Challenger event.

Finally, don’t miss the Player Schedules page, which aggregates ATP and Challenger entry lists to show you who is playing where for the next six weeks.

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The Historically Strong Dallas Challenger

All eyes are on Indian Wells this week, with seven of the top eight-ranked men in the world in the quarterfinals.  (Oh, and one epic streak coming to an end.)  Look a little deeper, though, and you’ll find another ATP event in progress, this one under the guise of a Challenger tournament.

By just about every metric imaginable, this week’s Dallas Challenger has one of the strongest Challenger fields ever assembled.  Many ATP 250s–and a few 500s–are barely at the same level.

Because of Dallas’s timing in between the opening rounds of Indian Wells and the beginning of the Miami Masters, special rules apply to tournament entries.  Higher-ranked players are able to make last-minute decisions to compete, hence the presence of the two top seeds, Marcos Baghdatis and Thomaz Bellucci.  Many other tour-level pros choose to make the stop in Dallas to get a couple of matches under their belt to compensate for a disappointing showing in the California desert.

Measuring field quality is tricky, but here we’re not working with subtle differences.  Here are some simple metrics we could use to the compare main draw strength of the 2500 or so Challenger events since 1991:

  • Average ATP Rank. In Dallas this year, it’s 103, the best ever in a Challenger event.  Second best is 109–that was the same event last year.  Only eight Challengers have ever had an average rank below 130, and the average is a whopping 290.
  • Median ATP Rank. Similar deal, without the risk of a few top players skewing the results.  Dallas’s median is 90; last year it was 90.5–best and second-best ever.  Only two others come in under 100, and the average is 239.
  • 8th seed ATP Rank. I like this metric as it indicates the presumed quality of the quarterfinals–every guy in the last 8 is either this good or has to beat someone this good.  Dallas’s 8-seed this year is #62 Lukas Rosol, the highest-ranked 8-seed ever in a challenger event.  Second place, once again, is the same event last year, where #69 Lukas Lacko was seeded eighth.  Only 18 events have ever had an 8-seed in the top 80, and the historical average is 180.
  • Average seed ATP Rank. Another angle: here Dallas is ousted, coming in 3rd of the 2500 events, at 48.  The 1991 Johannesburg Challenger (46.5) and 1994 Andorra Challenger (47.5) just barely beat it out.  Only 17 events have had an average seed rank better than 60, and the average is 145.
  • Number of top 50 players. Dallas is only the 3rd Challenger event to ever have five top 50 players, after 1991 Jo’burg and 2004 Dnepropetrovsk.  Only 66 Challengers have ever had multiple top-50 competititors, and fewer than 1 in 10 Challengers have a single one.  The average Challenger top seed is ranked #97.
  • Number of top 75/100/125 players.  12 players in the main draw this week are ranked in the top 75, 18 in the top 100, and 25 in the top 125.  All are either new records or tied with the old record.  The average challenger event has 0.13 top-50s, 0.57 top-75s, 1.71 top 100′s, and 3.81 top 125′s.

The one way in which this week’s tournament in Dallas doesn’t rank amongst the best is by a more sophisticated approach, the one that I use in my Challenger strength report on TennisAbstract.com.  By simulating the tournament draw several thousand times, we can estimate the likelihood of a certain level of player winning the event.  For instance, had the 50th-best player in the world entered the Burnie or West Lakes Challenger this year, he would have had about a 25% chance of winning.   But against the more competitive field in Quimper, that number drops to 12%–about the same as the 50th-best player’s chance in the unusually weak Los Angeles ATP event last year.

This week, Jurgen Melzer–ranked in the mid-40s on hard courts by my rating system–had a 9.3% chance of winning the title according to my pre-tourney simulations.  (Go to the tournament forecast page and click ‘R32′ under the ‘Forecast’ header.)  That puts Dallas comfortably among the top 10 toughest Challenger draws in the last year–and better than LA–but nowhere near the top.

It’s one thing to have a deep draw, but another thing entirely to have a tournament that is particularly hard to win.   For the latter, an event needs one or two very highly-ranked players, like Marin Cilic at last year’s Dallas Challenger, or Fernando Verdasco in Prostejov last year.  In theory, if not in practice, someone ranked in the top 20 should waltz to a title, offering an insurmountable obstacle to your typical Challenger-level player.

Dallas may not be the most difficult Challenger event to win, but by any measure of field quality and depth,  it’s one of the very strongest in ATP history.  The fans in Dallas are very fortunate this week.

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