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This report compares ATP players (minimum 20 tour-level matches) over the last 52 weeks by consistency--that is, how regularly they beat the players they are supposed to beat and lose to the players who are supposed to beat them.

The bigger the upset, the more it contributes to a player's score--the higher the Upset Score (uScore in the table), the more inconsistent the player. But only if the player wins matches he shouldn't and loses matches he shouldn't. If he is simply losing against a bunch of better players, that's a prolonged slump (or simply life at the top), not inconsistency.

Updated weekly. Last update: 2013-05-20

Rank	Player	Matches	uRate	uWins	uLosses	uTotal	uScore
49	Grega Zemlja	25	44.0%	9	2	11	16
57	David Goffin	37	29.7%	6	5	11	28
6	Tomas Berdych	74	24.3%	4	14	18	34
46	Nikolay Davydenko	48	35.4%	7	10	17	47
37	Jurgen Melzer	46	34.8%	4	12	16	22
67	Ricardas Berankis	23	39.1%	7	2	9	20
18	Philipp Kohlschreiber	55	27.3%	6	9	15	92
41	Mardy Fish	20	10.0%	0	2	2	0
69	Robin Haase	41	24.4%	6	4	10	23
66	Paolo Lorenzi	35	28.6%	9	1	10	3
59	Bernard Tomic	42	23.8%	1	9	10	4
48	Daniel Gimeno Traver	32	37.5%	11	1	12	11
13	Nicolas Almagro	68	13.2%	3	6	9	10
32	Julien Benneteau	49	38.8%	6	13	19	29
35	Martin Klizan	44	36.4%	7	9	16	50
40	Thomaz Bellucci	39	41.0%	8	8	16	90
5	David Ferrer	83	8.4%	0	7	7	0
44	Viktor Troicki	45	35.6%	6	10	16	19
38	Marcos Baghdatis	43	32.6%	6	8	14	36
29	Fabio Fognini	55	30.9%	11	6	17	47
1	Novak Djokovic	73	13.7%	0	10	10	0
63	Albert Ramos	48	29.2%	11	3	14	11
28	Grigor Dimitrov	56	35.7%	14	6	20	26
74	Lukas Lacko	26	26.9%	4	3	7	28
8	Jo Wilfried Tsonga	66	15.2%	1	9	10	8
105	Blaz Kavcic	21	23.8%	4	1	5	17
21	John Isner	54	35.2%	2	17	19	18
47	Horacio Zeballos	25	36.0%	5	4	9	75
100	Sergiy Stakhovsky	28	25.0%	3	4	7	51
-	Andy Roddick	20	25.0%	1	4	5	27
10	Janko Tipsarevic	61	26.2%	1	15	16	6
14	Tommy Haas	62	33.9%	11	10	21	160
51	Radek Stepanek	31	38.7%	7	5	12	61
56	Michael Llodra	22	50.0%	6	5	11	95
50	Ivan Dodig	40	37.5%	8	7	15	59
75	Edouard Roger Vasselin	38	31.6%	9	3	12	19
42	Jarkko Nieminen	48	33.3%	10	6	16	45
33	Marcel Granollers	47	40.4%	6	13	19	25
87	Ryan Harrison	31	29.0%	3	6	9	62
58	Dmitry Tursunov	24	45.8%	7	4	11	61
17	Gilles Simon	61	31.1%	7	12	19	29
143	Bjorn Phau	21	28.6%	3	3	6	31
54	Xavier Malisse	42	33.3%	5	9	14	32
82	Albert Montanes	21	33.3%	2	5	7	8
12	Marin Cilic	66	19.7%	3	10	13	23
52	Fernando Verdasco	38	39.5%	2	13	15	16
7	Juan Martin Del Potro	60	16.7%	3	7	10	53
138	Flavio Cipolla	25	28.0%	3	4	7	23
76	Paul Henri Mathieu	27	48.1%	8	5	13	114
187	David Nalbandian	24	33.3%	2	6	8	28
11	Stanislas Wawrinka	56	25.0%	8	6	14	55
62	Leonardo Mayer	21	47.6%	9	1	10	18
2	Andy Murray	64	18.8%	5	7	12	66
61	Marinko Matosevic	40	30.0%	7	5	12	53
147	Tatsuma Ito	22	27.3%	5	1	6	9
34	Tommy Robredo	39	30.8%	8	4	12	36
22	Andreas Seppi	53	28.3%	7	8	15	49
89	Jesse Levine	25	16.0%	1	3	4	1
110	Lukasz Kubot	35	51.4%	6	12	18	40
26	Benoit Paire	61	47.5%	18	11	29	45
20	Sam Querrey	59	27.1%	6	10	16	28
45	Feliciano Lopez	39	30.8%	2	10	12	8
64	Carlos Berlocq	42	33.3%	10	4	14	33
30	Florian Mayer	49	30.6%	1	14	15	5
24	Alexandr Dolgopolov	50	32.0%	3	13	16	16
109	Gael Monfils	26	34.6%	2	7	9	18
112	Filippo Volandri	25	36.0%	7	2	9	16
53	Pablo Andujar	42	31.0%	9	4	13	38
77	Tobias Kamke	29	31.0%	8	1	9	12
25	Kevin Anderson	59	28.8%	10	7	17	22
43	Denis Istomin	58	36.2%	10	11	21	45
81	Alex Bogomolov Jr	21	33.3%	2	5	7	20
65	Roberto Bautista Agut	20	50.0%	6	4	10	70
104	Steve Darcis	27	40.7%	7	4	11	36
39	Ernests Gulbis	40	35.0%	8	6	14	70
140	Ivo Karlovic	23	39.1%	1	8	9	9
86	Simone Bolelli	24	37.5%	8	1	9	10
60	Daniel Brands	26	34.6%	8	1	9	12
15	Kei Nishikori	52	28.8%	4	11	15	40
4	Rafael Nadal	49	10.2%	2	3	5	72
27	Jeremy Chardy	47	31.9%	8	7	15	105
68	Igor Sijsling	30	30.0%	6	3	9	25
31	Mikhail Youzhny	53	32.1%	4	13	17	26
19	Juan Monaco	49	36.7%	4	14	18	26
71	Andrey Kuznetsov	20	20.0%	3	1	4	31
83	Gilles Muller	32	46.9%	8	7	15	56
16	Milos Raonic	55	30.9%	3	14	17	18
70	Alejandro Falla	37	27.0%	6	4	10	44
96	Benjamin Becker	23	30.4%	3	4	7	20
3	Roger Federer	65	18.5%	2	10	12	18
9	Richard Gasquet	64	25.0%	4	12	16	22
55	Victor Hanescu	20	15.0%	3	0	3	0
23	Jerzy Janowicz	30	46.7%	10	4	14	76
79	Guillermo Garcia Lopez	32	40.6%	4	9	13	35
115	Go Soeda	31	16.1%	5	0	5	0
72	Yen Hsun Lu	33	30.3%	6	4	10	25
36	Lukas Rosol	36	41.7%	11	4	15	37
93	James Blake	25	36.0%	5	4	9	22
122	Matthew Ebden	31	12.9%	2	2	4	23
85	Lleyton Hewitt	34	38.2%	12	1	13	11
78	Santiago Giraldo	30	33.3%	4	6	10	23