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On the ATP and Challenger tours, tournament strength varies wildly, even among events with similar prize money and ranking points. This report allows you to compare field quality across tournaments, using a technique suggested by Carl Bialik.

The fields such as "wp(50)" refer to the chance that the 50th-ranked player in would have won the event, while "pts(50)" shows the 50th-ranked player's "expected points," which takes into account the ATP ranking points awarded to winners.

For more on the methodology, here is the article in which I introduced this approach. Click the column headers to sort, and shift-click to sort by multiple columns.

Updated weekly. Last update: 2013-03-04

Date	Event	Pts	Draw	Surface	Rk	Top Seed	Rk	Champ	wp(50)	epts(50)	wp(100)	epts(100)	wp(200)	epts(200)
2013-01-21	Heilbronn CH	110	32	Hard	60	Paul Henri Mathieu	135	Michael Berrer	8.9%	23	3.4%	14	0.7%	7
2013-01-28	Burnie CH	80	32	Hard	181	Peter Polansky	183	John Millman	25.2%	32	14.6%	23	5.1%	14
2013-01-22	Bucaramanga CH	80	32	Clay	64	Santiago Giraldo	142	Federico Delbonis	13.4%	21	5.9%	13	2.8%	9
2013-02-11	Quimper CH	90	32	Hard	80	Roberto Bautista Agut	160	Marius Copil	11.8%	23	4.9%	15	1.1%	7
2013-02-04	Bergamo CH	90	32	Hard	136	Ernests Gulbis	208	Michal Przysiezny	14.9%	28	7.1%	19	1.6%	9
2013-02-25	Sydney1 CH	80	32	Hard	137	Yuichi Sugita	559	Nick Kyrgios	27.3%	34	15.9%	25	5.0%	14
2013-02-04	West Lakes CH	80	32	Hard	117	Yuichi Sugita	429	Matthew Barton	24.5%	32	13.8%	23	4.1%	12
2013-02-04	Dallas CH	100	32	Hard	104	Jesse Levine	191	Rhyne Williams	12.2%	26	5.3%	17	1.2%	8
2012-12-31	Sao Paulo CH	125	32	Hard	85	Horacio Zeballos	85	Horacio Zeballos	34.6%	61	21.7%	46	8.4%	27
2013-02-25	Cherbourg CH	90	32	Hard	63	Gilles Muller	346	Jesse Huta Galung	15.8%	28	7.7%	20	1.8%	11
2012-12-31	Noumea CH	100	32	Hard	93	Steve Darcis	192	Adrian Mannarino	19.7%	34	9.2%	23	2.6%	11
2013-01-21	Maui CH	80	32	Hard	73	Go Soeda	73	Go Soeda	15.8%	25	6.4%	14	2.1%	9
2013-02-25	Salinas CH	80	32	Clay	110	Thiemo De Bakker	213	Alejandro Gonzalez	14.9%	23	7.5%	15	4.1%	11
2012-07-09	San Benedetto CH	80	32	Clay	159	Andreas Haider Maurer	223	Gianluca Naso	17.9%	25	7.6%	16	4.5%	12
2012-08-06	San Marino CH	110	32	Clay	52	Martin Klizan	52	Martin Klizan	13.5%	29	5.5%	18	2.7%	12
2012-11-19	Tyumen CH	80	32	Hard	96	Evgeny Donskoy	96	Evgeny Donskoy	28.5%	37	16.9%	28	4.4%	13
2012-03-05	Kyoto CH	80	32	Carpet	77	Go Soeda	105	Tatsuma Ito	18.9%	28	10.4%	20	3.0%	11
2012-04-02	St. Brieuc CH	80	32	Clay	105	Daniel Gimeno Traver	261	Gregoire Burquier	16.1%	23	7.5%	15	3.7%	11
2012-04-23	Kaohsiung CH	125	32	Hard	56	Yen Hsun Lu	74	Go Soeda	14.7%	36	7.7%	26	2.1%	14
2012-04-23	Sao Paulo2 CH	80	32	Clay	105	Blaz Kavcic	105	Blaz Kavcic	18.2%	26	7.8%	16	3.9%	11
2012-03-26	Barranquilla CH	90	32	Clay	71	Alejandro Falla	71	Alejandro Falla	15.4%	26	7.0%	17	3.4%	11
2012-04-16	Santos CH	80	32	Clay	99	Joao Souza	239	Ivo Minar	14.9%	23	7.1%	15	3.4%	10
2012-04-02	San Luis Potosi CH	80	32	Clay	91	Paolo Lorenzi	125	Ruben Ramirez Hidalgo	20.7%	28	10.7%	19	5.5%	13
2012-05-14	Fergana CH	80	32	Hard	138	Marco Chiudinelli	297	Yuki Bhambri	21.9%	30	10.6%	19	4.1%	13
2012-05-07	Prague CH	100	32	Clay	62	Dudi Sela	117	Horacio Zeballos	11.1%	23	3.7%	13	1.8%	9
2012-09-04	Genova CH	110	32	Clay	27	Andreas Seppi	111	Albert Montanes	9.9%	26	4.2%	17	1.8%	11
2012-10-08	Tiburon CH	100	32	Hard	84	Benjamin Becker	220	Jack Sock	14.1%	28	6.2%	18	1.8%	11
2012-09-10	Banja Luka CH	100	32	Clay	77	Blaz Kavcic	97	Victor Hanescu	17.0%	32	8.3%	22	3.8%	14
2012-03-19	Marrakech CH	80	32	Clay	87	Pere Riba	106	Martin Klizan	12.2%	20	5.1%	13	2.3%	8
2012-06-25	Milan CH	80	32	Clay	109	Frederico Gil	266	Tommy Robredo	13.1%	20	5.1%	12	2.6%	9
2012-08-13	Cordenons CH	110	32	Clay	69	Blaz Kavcic	93	Paolo Lorenzi	11.2%	26	4.5%	17	2.3%	12
2012-07-30	Manta CH	80	32	Hard	133	Joao Souza	185	Guido Pella	40.1%	44	27.5%	35	10.9%	21
2012-05-14	Bordeaux CH	110	32	Clay	55	Jeremy Chardy	97	Martin Klizan	9.5%	23	3.5%	14	1.8%	10
2012-07-16	Penza CH	80	32	Hard	171	Alexander Kudryavtsev	440	Illya Marchenko	28.3%	35	16.5%	26	6.0%	16
2012-07-23	Lexington CH	80	32	Hard	179	Maxime Authom	209	Denis Kudla	25.9%	33	14.7%	24	4.7%	14
2012-07-30	Vancouver CH	100	32	Hard	102	Igor Sijsling	102	Igor Sijsling	14.1%	28	6.5%	19	1.6%	10
2012-10-29	Medellin CH	90	32	Clay	71	Leonardo Mayer	76	Paolo Lorenzi	15.2%	27	7.6%	19	4.2%	14
2012-06-11	Kosice CH	80	32	Clay	126	Alessandro Giannessi	129	Aljaz Bedene	12.7%	20	5.8%	13	3.2%	10
2012-07-02	Winnetka CH	80	32	Hard	124	Benjamin Becker	298	John Patrick Smith	14.5%	24	6.0%	14	1.4%	7
2012-06-04	Prostejov CH	125	32	Clay	16	Fernando Verdasco	35	Florian Mayer	5.4%	23	1.5%	12	0.8%	9
2012-11-19	Toyota CH	80	32	Carpet	119	Yuichi Sugita	266	Michal Przysiezny	25.7%	33	14.2%	24	3.9%	12
2012-07-23	Tampere CH	80	32	Clay	145	Joao Sousa	145	Joao Sousa	18.7%	26	8.2%	16	4.4%	12
2012-09-10	Istanbul CH	90	32	Hard	104	Malek Jaziri	147	Dmitry Tursunov	16.1%	28	7.3%	19	2.4%	12
2012-04-16	Rome CH	80	32	Clay	84	Ernests Gulbis	149	Roberto Bautista Agut	9.5%	18	3.7%	11	1.8%	7
2012-06-05	Nottingham CH	90	32	Grass	58	Go Soeda	157	Benjamin Becker	8.4%	19	3.8%	12	0.5%	5
2012-09-03	Shanghai CH	80	32	Hard	64	Yen Hsun Lu	64	Yen Hsun Lu	19.3%	28	9.1%	19	2.9%	12
2012-09-24	Orleans CH	125	32	Hard	18	Philipp Kohlschreiber	55	David Goffin	7.1%	25	2.1%	14	0.6%	9
2012-07-09	Scheveningen CH	90	32	Clay	109	Jerzy Janowicz	109	Jerzy Janowicz	16.9%	28	7.0%	17	3.8%	13
2012-10-22	Buenos Aires CH	90	32	Clay	72	Leonardo Mayer	245	Diego Sebastian Schwartzman	13.5%	25	6.9%	17	3.3%	12
2012-06-11	Monza CH	100	32	Clay	99	Albert Montanes	125	Daniel Gimeno Traver	10.2%	22	4.4%	14	2.3%	10
2012-10-01	Mons CH	125	32	Hard	48	David Goffin	202	Kenny De Schepper	8.5%	27	2.5%	14	0.5%	8
2012-10-01	Sacramento CH	100	32	Hard	85	Benjamin Becker	97	James Blake	16.6%	31	6.9%	20	2.2%	12
2012-04-23	Savannah CH	80	32	Clay	88	Dmitry Tursunov	293	Brian Baker	17.0%	25	6.8%	15	3.3%	10
2012-04-09	Pereira CH	90	32	Clay	53	Santiago Giraldo	248	Carlos Salamanca	15.5%	29	7.1%	19	3.2%	12
2012-04-16	Sarasota CH	100	32	Clay	77	James Blake	98	Sam Querrey	11.9%	25	4.5%	14	2.3%	10
2012-10-08	Tashkent CH	125	32	Hard	59	Lukas Lacko	195	Uladzimir Ignatik	14.1%	36	6.2%	24	1.8%	14
2012-08-06	Aptos CH	100	32	Hard	78	Brian Baker	378	Steve Johnson	13.4%	26	6.0%	17	1.4%	9
2012-10-29	Charlottesville CH	90	32	Hard	74	Jesse Levine	164	Denis Kudla	15.6%	28	7.1%	19	1.9%	11
2012-06-05	Furth CH	80	32	Clay	83	Sergiy Stakhovsky	99	Blaz Kavcic	12.7%	20	5.0%	12	2.8%	9
2012-04-30	Ostrava CH	80	32	Clay	136	Jan Hajek	182	Jonathan Dasnieres De Veigy	19.8%	27	8.9%	17	4.7%	12
2012-07-23	Orbetello CH	80	32	Clay	123	Roberto Bautista Agut	123	Roberto Bautista Agut	18.4%	26	8.1%	17	4.3%	11
2012-10-15	Rio de Janeiro CH	90	32	Clay	91	Ruben Ramirez Hidalgo	174	Gastao Elias	12.9%	24	6.6%	17	3.5%	12
2012-10-01	Belem CH	80	32	Hard	126	Thiago Alves	366	Ricardo Hocevar	33.4%	38	19.4%	28	8.4%	18
2012-09-24	Lermontov CH	90	32	Clay	83	Paolo Lorenzi	91	Andrey Kuznetsov	18.3%	31	9.8%	22	4.6%	14
2012-08-20	Segovia CH	90	32	Hard	102	Daniel Gimeno Traver	140	Evgeny Donskoy	24.9%	37	15.1%	28	5.5%	17
2012-07-16	Poznan CH	80	32	Clay	87	Jerzy Janowicz	87	Jerzy Janowicz	16.1%	24	7.3%	16	3.5%	10
2012-09-10	Seville CH	90	32	Clay	89	Roberto Bautista Agut	113	Daniel Gimeno Traver	12.2%	24	5.6%	16	2.6%	11
2012-11-05	Sao Leopoldo CH	80	32	Clay	98	Andreas Haider Maurer	95	Horacio Zeballos	14.7%	22	6.5%	14	3.3%	10
2012-11-12	Helsinki CH	125	32	Hard	46	Jarkko Nieminen	53	Lukas Lacko	11.4%	32	4.1%	18	0.9%	10
2012-09-17	Trnava CH	90	32	Clay	86	Lukas Rosol	116	Andrey Kuznetsov	14.4%	26	6.7%	17	3.2%	12
2012-04-09	Leon CH	80	32	Hard	119	Marinko Matosevic	615	Denis Zivkovic	27.1%	35	17.4%	27	6.6%	17
2012-08-13	Karshi CH	80	32	Hard	145	Igor Kunitsyn	145	Igor Kunitsyn	30.4%	38	19.9%	30	8.3%	20
2012-09-04	Alphen aan den Rijn CH	80	32	Clay	96	Daniel Gimeno Traver	187	Thiemo De Bakker	14.2%	22	7.0%	15	3.4%	10
2012-05-07	Rio Quente CH	80	32	Hard	114	Paul Capdeville	284	Guilherme Clezar	31.2%	38	21.3%	30	6.8%	16
2012-10-22	Seoul CH	110	32	Hard	70	Yen Hsun Lu	70	Yen Hsun Lu	14.5%	31	6.6%	20	1.7%	11
2012-10-29	Montevideo CH	80	32	Clay	99	Joao Sousa	119	Horacio Zeballos	12.2%	20	5.7%	13	3.0%	10
2012-11-05	Guayaquil CH	90	32	Clay	77	Leonardo Mayer	77	Leonardo Mayer	15.9%	27	7.3%	18	3.5%	12
2012-05-07	Busan CH	100	32	Hard	58	Yen Hsun Lu	81	Tatsuma Ito	17.7%	33	8.2%	21	2.1%	11
2012-07-16	Recanati CH	80	32	Hard	69	Malek Jaziri	121	Simone Bolelli	25.3%	34	13.6%	25	4.6%	15
2012-03-12	Rabat CH	80	32	Clay	60	Filippo Volandri	118	Martin Klizan	13.0%	21	5.0%	13	2.4%	8
2012-03-05	Santiago CH	80	32	Clay	103	Eric Prodon	137	Paul Capdeville	14.9%	22	6.2%	13	3.1%	9
2012-04-09	Blumenau CH	80	32	Clay	112	Blaz Kavcic	150	Antonio Veic	19.7%	28	10.2%	19	4.9%	13
2012-09-10	Ningbo CH	80	32	Hard	59	Yen Hsun Lu	204	Peter Gojowczyk	23.1%	31	11.7%	22	4.3%	14
2012-09-17	Campinas CH	80	32	Clay	88	Alex Bogomolov Jr	141	Guido Pella	15.7%	24	7.8%	16	3.9%	11
2012-08-06	Sibiu CH	80	32	Clay	105	Adrian Ungur	105	Adrian Ungur	15.2%	23	6.9%	15	3.4%	10
2012-09-04	Brasov CH	80	32	Clay	102	Victor Hanescu	156	Andreas Haider Maurer	17.4%	26	9.0%	18	4.2%	12
2012-04-02	Tallahassee CH	80	32	Hard	88	Ryan Sweeting	282	Tim Smyczek	12.9%	22	6.4%	15	1.5%	8
2012-09-10	Todi CH	80	32	Clay	72	Paolo Lorenzi	126	Andrey Kuznetsov	15.5%	23	7.2%	15	3.6%	10
2012-07-09	Bogota CH	125	32	Clay	29	Feliciano Lopez	58	Alejandro Falla	14.0%	38	5.5%	24	3.1%	19
2012-07-16	Binghamton CH	80	32	Hard	112	Dudi Sela	261	Michael Yani	19.1%	28	9.5%	19	2.7%	11
2012-07-16	An-Ning CH	80	32	Clay	114	Aljaz Bedene	119	Grega Zemlja	18.6%	27	8.7%	18	4.2%	12
2012-07-09	Timisoara CH	80	32	Clay	140	Victor Hanescu	140	Victor Hanescu	17.9%	26	7.5%	16	4.4%	13
2012-07-23	Wuhan CH	80	32	Hard	103	Aljaz Bedene	103	Aljaz Bedene	26.0%	33	14.5%	24	4.9%	14
2012-07-16	Bercuit CH	80	32	Clay	75	Steve Darcis	241	Thiemo De Bakker	14.4%	22	6.1%	14	2.8%	9
2012-07-02	Lima CH	90	32	Clay	121	Eric Prodon	333	Guido Andreozzi	19.8%	31	9.3%	21	5.1%	15
2012-10-01	Quito CH	80	32	Clay	132	Frederico Gil	152	Joao Souza	18.5%	26	9.6%	18	5.5%	14
2012-09-10	Cali CH	100	32	Clay	43	Santiago Giraldo	171	Joao Souza	14.3%	28	6.4%	18	3.0%	12
2012-04-30	Tunis CH	125	32	Clay	27	Marcel Granollers	97	Ruben Ramirez Hidalgo	12.7%	34	4.7%	20	2.3%	13
2012-07-23	Astana CH	110	32	Hard	100	Cedrik Marcel Stebe	173	Evgeny Donskoy	23.1%	44	11.8%	30	4.0%	19
2012-03-12	Guadalajara CH	100	32	Hard	87	Edouard Roger Vasselin	216	Thiago Alves	13.4%	27	6.1%	17	1.4%	9
2012-06-11	Nottingham2 CH	90	32	Grass	108	Dudi Sela	142	Grega Zemlja	11.9%	24	5.8%	16	1.3%	8
2012-10-29	Geneva CH	100	32	Hard	78	Tobias Kamke	188	Marc Gicquel	12.7%	26	5.4%	17	1.4%	9
2012-08-06	Pozoblanco CH	80	32	Hard	110	Roberto Bautista Agut	110	Roberto Bautista Agut	19.2%	27	9.8%	18	2.7%	9
2012-09-10	Petange CH	90	32	Hard	66	Gilles Muller	87	Tobias Kamke	14.0%	26	6.5%	17	1.9%	10
2012-09-04	St. Remy CH	80	32	Hard	53	Gilles Muller	147	Josselin Ouanna	15.7%	24	6.7%	14	2.0%	9
2012-03-19	Rimouski CH	80	32	Hard	94	Tatsuma Ito	111	Vasek Pospisil	20.6%	29	12.3%	22	4.2%	13
2012-06-25	Marburg CH	80	32	Clay	98	Horacio Zeballos	105	Jan Hajek	13.3%	20	5.0%	12	2.6%	9
2012-11-12	Marbella CH	80	32	Clay	73	Daniel Gimeno Traver	118	Albert Montanes	13.1%	21	5.6%	13	2.7%	9
2012-05-07	Rome2 CH	80	32	Clay	55	Gilles Muller	189	Jerzy Janowicz	13.6%	22	5.2%	13	2.7%	9
2012-10-08	San Juan CH	80	32	Clay	81	Leonardo Mayer	150	Thiemo De Bakker	11.9%	20	6.1%	14	2.9%	9
2012-10-22	Porto Alegre CH	80	32	Clay	98	Ruben Ramirez Hidalgo	178	Simon Greul	11.8%	20	5.9%	14	2.8%	9
2012-11-12	Champaign CH	80	32	Hard	85	Michael Russell	152	Tim Smyczek	18.6%	28	9.2%	19	2.7%	11
2012-10-29	Eckental CH	80	32	Carpet	51	Grega Zemlja	131	Daniel Brands	15.5%	25	7.4%	17	2.0%	10
2012-11-05	Bratislava CH	110	32	Hard	57	Lukas Lacko	84	Lukas Rosol	10.3%	27	4.3%	18	0.8%	8
2012-08-06	Samarkand CH	80	32	Clay	144	Igor Kunitsyn	168	Dusan Lajovic	23.6%	32	12.8%	23	6.9%	16
2012-04-23	Napoli CH	80	32	Clay	61	Gilles Muller	187	Andrey Kuznetsov	15.5%	23	6.2%	14	3.0%	10
2012-09-17	Szczecin CH	125	32	Clay	75	Filippo Volandri	80	Victor Hanescu	11.5%	31	4.4%	18	2.3%	13
2012-07-02	Braunschweig CH	125	32	Clay	37	Carlos Berlocq	80	Thomaz Bellucci	9.4%	27	3.0%	15	1.6%	12
2012-03-13	Dallas2 CH	125	32	Hard	24	Marin Cilic	175	Frank Dancevic	6.8%	24	2.7%	15	0.5%	7
2012-11-12	Yokohama CH	80	32	Hard	66	Tatsuma Ito	138	Matteo Viola	24.0%	31	13.3%	22	4.2%	13
2012-04-09	Mersin CH	80	32	Clay	90	Martin Klizan	172	Joao Sousa	12.9%	21	5.7%	13	2.7%	9
2012-10-15	Villa Allende CH	80	32	Clay	78	Leonardo Mayer	124	Guillaume Rufin	14.9%	23	7.7%	17	4.5%	13
2012-03-27	Le Gosier CH	110	32	Hard	52	Olivier Rochus	148	David Goffin	9.6%	25	4.0%	16	1.2%	10
2012-07-16	Granby CH	90	32	Hard	109	Vasek Pospisil	109	Vasek Pospisil	24.2%	36	12.0%	24	4.0%	15
2012-03-19	Bath CH	80	32	Hard	97	Andreas Beck	172	Dustin Brown	14.2%	24	7.4%	17	2.2%	10
2012-03-12	Pingguo CH	80	32	Hard	77	Go Soeda	77	Go Soeda	20.2%	28	11.5%	20	3.5%	11
2012-07-30	Beijing CH	100	32	Hard	83	Aljaz Bedene	114	Grega Zemlja	20.8%	36	10.9%	25	3.2%	14
2012-05-07	Athens CH	80	32	Hard	89	Igor Kunitsyn	105	Marinko Matosevic	15.9%	25	9.2%	19	1.9%	8
2012-06-05	Caltanissetta CH	100	32	Clay	52	Alejandro Falla	470	Tommy Robredo	11.5%	24	4.3%	14	2.3%	10
2012-08-27	Bangkok CH	80	32	Hard	109	Dudi Sela	109	Dudi Sela	23.6%	32	12.3%	22	4.4%	14
2012-09-24	Madrid CH	80	32	Clay	89	Filippo Volandri	74	Daniel Gimeno Traver	12.4%	20	5.4%	13	2.6%	9
2012-03-12	Sarajevo CH	80	32	Hard	96	Andreas Beck	242	Jan Hernych	15.5%	25	8.3%	19	2.3%	11
2012-08-27	Como CH	80	32	Clay	113	Frederico Gil	156	Andreas Haider Maurer	13.2%	21	6.3%	14	3.1%	9
2012-10-08	Rennes CH	90	32	Hard	90	Aljaz Bedene	144	Kenny De Schepper	15.2%	28	6.9%	18	2.1%	11
2012-09-17	Izmir CH	90	32	Hard	113	Malek Jaziri	125	Dmitry Tursunov	16.0%	28	7.7%	19	2.3%	11
2012-07-03	Arad CH	80	32	Clay	102	Daniel Brands	222	Facundo Bagnis	14.4%	22	6.2%	14	3.2%	10
2012-04-02	Barletta CH	80	32	Clay	57	Fabio Fognini	174	Aljaz Bedene	12.2%	20	4.8%	12	2.4%	8
2012-07-03	Panama City CH	80	32	Clay	112	Michael Russell	114	Rogerio Dutra Silva	18.4%	26	8.3%	17	4.5%	12
2012-11-05	Ortisei CH	90	32	Hard	23	Andreas Seppi	79	Benjamin Becker	12.7%	24	5.5%	16	1.1%	7
2012-11-05	Loughborough CH	80	32	Hard	83	Tobias Kamke	122	Evgeny Donskoy	18.4%	26	9.3%	18	2.2%	9
2012-07-23	Oberstaufen CH	80	32	Clay	104	Daniel Gimeno Traver	234	Dominik Meffert	14.2%	22	5.6%	13	3.0%	9
2012-11-05	Knoxville CH	80	32	Hard	85	Jesse Levine	103	Michael Russell	16.9%	26	8.2%	18	1.7%	8
2013-03-11	Dallas Challenger	125	32	Hard	35	Marcos Baghdatis	1001	TBD	10.6%	38	2.0%	13	0.4%	7