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What are the fastest and slowest surfaces on the ATP tour?

Each tournament's relative ace rate is calculated by estimating how many aces each player would hit in each match on a neutral surface, then comparing that number to the actual number of aces hit. The first four columns show the resulting ratio for the years 2009-2012; the last two columns show 3/2/1 weighted averages of the years 2009-11 and 2010-12 for each tournament. The most recent available weighted average is the most accurate reflection of the surface speed, and the best forecast of surface characteristics for next year's event.

Last update: 2012-11-05

Event	Surface	09 A%	10 A%	11 A%	12 A%	11 Wgt	12 Wgt
Costa Do Sauipe	Clay	1.03	1.37	1.20	1.58	1.23	1.42
Marseille	Hard	1.31	1.09	1.30	1.45	1.23	1.34
Halle	Grass	1.09	1.20	1.44	1.22	1.30	1.29
Montpellier	Hard	1.33	1.28		1.44		1.27
Wimbledon	Grass	1.32	1.37	1.26	1.21	1.31	1.25
Zagreb	Hard	0.95	1.09	1.29	1.23	1.17	1.23
Washington	Hard	1.01	0.96	0.99	1.38	0.99	1.18
London Olympics	Grass				1.28		1.14
San Jose	Hard	1.11	1.21	1.41	0.93	1.30	1.14
Doha	Hard	0.87	0.88	1.54	0.94	1.21	1.13
Paris Masters	Hard	1.36	1.39	1.01	1.13	1.19	1.13
Vienna	Hard	1.10	1.42	1.25	0.95	1.28	1.13
Tokyo	Hard	1.35	1.35	1.01	1.13	1.18	1.13
Brisbane	Hard	0.86	1.01	1.20	1.10	1.08	1.12
Valencia	Hard	0.98	1.02	1.15	1.12	1.08	1.11
Basel	Hard	1.34	0.98	1.11	1.15	1.10	1.11
Winston-Salem	Hard			1.19	1.07	1.09	1.10
Auckland	Hard	1.05	1.01	1.13	1.12	1.07	1.10
Queen's Club	Grass	1.20	1.07	1.13	1.08	1.12	1.09
Cincinnati Masters	Hard	1.21	1.09	1.09	1.07	1.11	1.08
Dubai	Hard	1.09	1.13	1.08	1.03	1.10	1.07
s-Hertogenbosch	Grass	1.28	1.13	1.04	1.05	1.11	1.06
Stuttgart	Clay	0.97	1.09	1.15	0.98	1.10	1.06
Sydney	Hard	0.95	1.08	1.18	0.96	1.11	1.05
Moscow	Hard	1.36	1.28	1.17	0.89	1.24	1.05
Stockholm	Hard	1.18	0.93	0.92	1.16	0.97	1.04
Shanghai Masters	Hard	1.08	0.96	1.03	1.07	1.02	1.04
Atlanta	Hard		0.92	0.90	1.16	0.92	1.03
Newport	Grass	0.80	1.46	0.69	1.09	0.97	1.02
Delray Beach	Hard	0.77	0.98	1.19	0.92	1.05	1.02
US Open	Hard	0.97	1.13	0.93	1.05	1.00	1.02
Metz	Hard	1.18	1.14	0.95	1.03	1.06	1.02
Canada Masters	Hard	1.11	0.99	1.06	1.00	1.04	1.02
Eastbourne	Grass	1.03	1.07	1.08	0.94	1.07	1.01
Beijing	Hard	1.05	1.01	0.99	1.03	1.01	1.01
Memphis	Hard	1.20	1.09	1.08	0.93	1.10	1.01
Acapulco	Clay	1.12	0.89	0.93	1.10	0.95	1.01
Australian Open	Hard	0.98	0.98	1.13	0.92	1.06	1.00
Chennai	Hard	0.99	0.76	0.84	1.20	0.84	1.00
Madrid Masters	Clay	0.81	0.76	0.92	1.12	0.85	0.99
Rotterdam	Hard	1.20	0.88	1.28	0.81	1.14	0.98
Santiago	Clay	0.80	1.22	1.32	0.65	1.20	0.97
Gstaad	Clay	0.94	0.87	1.17	0.84	1.03	0.96
Miami Masters	Hard	0.92	0.91	1.04	0.87	0.98	0.93
Bangkok	Hard	1.16	1.21	1.06	0.75	1.12	0.93
Munich	Clay	0.75	0.78	0.98	0.93	0.87	0.92
Indian Wells Masters	Hard	0.94	0.91	0.96	0.87	0.94	0.91
Buenos Aires	Clay	0.69	0.87	1.00	0.85	0.90	0.90
Kuala Lumpur	Hard	0.95	0.96	1.02	0.74	0.99	0.87
Casablanca	Clay	0.99	0.82	0.96	0.80	0.92	0.86
Roland Garros	Clay	0.82	0.83	0.87	0.81	0.85	0.83
Barcelona	Clay	0.89	0.74	0.70	0.94	0.74	0.83
Hamburg	Clay	0.85	1.04	0.85	0.75	0.91	0.83
Los Angeles	Hard	0.68	0.81	0.71	0.90	0.74	0.82
St. Petersburg	Hard	0.89	1.02	0.86	0.71	0.92	0.81
Nice	Clay		0.89	0.80	0.77	0.86	0.80
Belgrade	Clay	0.54	0.72	0.64	0.92	0.65	0.79
Kitzbuhel	Clay			1.05	0.50	1.03	0.77
Bucharest	Clay	1.06	0.61	0.97	0.61	0.86	0.73
Houston	Clay	0.83	0.85	0.71	0.69	0.78	0.73
Estoril	Clay	0.69	0.62	0.64	0.78	0.64	0.71
Rome Masters	Clay	0.61	0.79	0.72	0.66	0.73	0.70
Bastad	Clay	0.79	0.93	0.72	0.59	0.80	0.69
Umag	Clay	0.86	0.56	0.66	0.74	0.66	0.68
Monte Carlo Masters	Clay	0.57	0.63	0.62	0.71	0.62	0.67
Dusseldorf	Clay	0.77	0.70	0.47	0.64	0.60	0.59
Tour Finals	Hard	1.18	1.08	0.97		1.04
Johannesburg	Hard	1.06	1.13	1.13		1.12