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Date
Winner
Loser
Tournament
Round
Score
2019-09-09
Su Wei Hsieh (29)
Risa Ozaki (292)
Hiroshima
R32
6-1 3-6 6-3
2018-04-02
Magdalena Rybarikova (17)
Risa Ozaki (267)
Monterrey
R32
6-4 6-3
2018-01-29
Yafan Wang (152)
Risa Ozaki (132)
Taipei
R32
6-2 6-4
2017-10-09
Venus Williams (5)
Risa Ozaki (95)
Hong Kong
R32
6-2 6-2
2017-09-25
Pauline Parmentier (100)
Risa Ozaki (91)
Tashkent
R32
6-2 6-4
2017-09-18
Shelby Rogers (59)
Risa Ozaki (92)
Tokyo
R32
6-2 7-6(5)
2017-09-11
Magda Linette (76)
Risa Ozaki (90)
Tokyo
R32
6-1 7-5
2017-08-28
Shuai Zhang (26)
Risa Ozaki (96)
US Open
R64
6-0 6-3
2017-08-28
Risa Ozaki (96)
Danielle Lao (219)
US Open
R128
6-3 6-7(5) 7-6(5)
2017-07-31
Sara Errani (103)
Risa Ozaki (78)
Washington
R32
7-6(0) 6-2
2017-07-24
Lin Zhu (122)
Risa Ozaki (79)
Nanchang
R32
6-0 7-5
2017-07-03
Denisa Allertova (107)
Risa Ozaki (77)
Wimbledon
R128
7-6(5) 2-6 6-3
2017-06-26
Naomi Osaka (58)
Risa Ozaki (75)
Eastbourne
R64
6-0 6-1
2017-06-19
Victoria Azarenka ()
Risa Ozaki (74)
Calvia
R32
6-3 4-6 7-6(7)
2017-06-12
Kristina Mladenovic (13)
Risa Ozaki (73)
's Hertogenbosch
R32
7-5 6-1
2017-05-29
Eugenie Bouchard (57)
Risa Ozaki (72)
Roland Garros
R128
2-6 6-3 6-2
2017-05-22
Qiang Wang (50)
Risa Ozaki (72)
Strasbourg
R32
6-4 3-6 6-3
2017-03-20
Angelique Kerber (1)
Risa Ozaki (87)
Miami
R16
6-2 6-2
2017-03-20
Risa Ozaki (87)
Julia Goerges (47)
Miami
R32
7-6(5) 6-3
2017-03-20
Risa Ozaki (87)
Kiki Bertens (21)
Miami
R64
6-4 4-6 6-1
2017-03-20
Risa Ozaki (87)
Louisa Chirico (63)
Miami
R128
3-6 7-5 6-1
2017-03-06
Naomi Osaka (52)
Risa Ozaki (90)
Indian Wells
R128
6-4 6-2
2017-02-27
Kai Lin Zhang (131)
Risa Ozaki (88)
Kuala Lumpur
R16
6-2 6-4
2017-02-27
Risa Ozaki (88)
Cagla Buyukakcay (94)
Kuala Lumpur
R32
6-2 3-6 6-4
2017-01-30
Misaki Doi (41)
Risa Ozaki (94)
Taipei
R16
6-4 6-3
2017-01-30
Risa Ozaki (94)
Sorana Cirstea (59)
Taipei
R32
7-6(3) 3-2 RET
2017-01-16
Sara Errani (53)
Risa Ozaki (93)
Australian Open
R128
7-5 6-1
2017-01-09
Monica Niculescu (40)
Risa Ozaki (100)
Hobart
QF
6-4 6-4
2017-01-09
Risa Ozaki (100)
Lucie Safarova (62)
Hobart
R16
2-6 6-3 7-5
2017-01-09
Risa Ozaki (100)
Kurumi Nara (76)
Hobart
R32
0-6 7-5 6-3
2016-10-10
Venus Williams (14)
Risa Ozaki (117)
Hong Kong
R32
6-4 6-1
2016-09-26
Nao Hibino (78)
Risa Ozaki (126)
Tashkent
R16
7-5 6-1
2016-09-26
Risa Ozaki (126)
Elitsa Kostova (134)
Tashkent
R32
3-6 6-4 6-1
2016-09-12
Varvara Lepchenko (84)
Risa Ozaki (111)
Japan Open Tokyo
R32
6-0 6-2
2016-08-01
Vania King (106)
Risa Ozaki (133)
Nanchang
SF
6-2 6-2
2016-08-01
Risa Ozaki (133)
Francesca Schiavone (104)
Nanchang
QF
5-7 6-1 6-2
2016-08-01
Risa Ozaki (133)
Nicha Lertpitaksinchai (418)
Nanchang
R16
6-0 6-3
2016-08-01
Risa Ozaki (133)
Na Lae Han (200)
Nanchang
R32
6-3 6-1
2016-07-18
Yulia Putintseva (45)
Risa Ozaki (136)
Washington
QF
6-4 6-2
2016-07-18
Risa Ozaki (136)
Naomi Broady (84)
Washington
R32
6-1 5-7 6-4
2016-07-18
Risa Ozaki (136)
Sloane Stephens (23)
Washington
R64
6-2 6-1
2016-06-06
Viktorija Golubic (113)
Risa Ozaki (124)
's Hertogenbosch
R16
6-4 6-2
2016-06-06
Risa Ozaki (124)
Kirsten Flipkens (61)
's Hertogenbosch
R32
6-4 6-2
2016-03-07
Eugenie Bouchard (42)
Risa Ozaki (125)
Indian Wells
R128
2-6 6-4 6-2
2016-02-29
Elina Svitolina (19)
Risa Ozaki (133)
Kuala Lumpur
R16
6-1 3-6 6-0
2016-02-29
Risa Ozaki (133)
Elizaveta Kulichkova (87)
Kuala Lumpur
R32
6-0 6-2
2015-10-12
Samantha Stosur (28)
Risa Ozaki (130)
Hong Kong
R32
6-3 6-1
2015-09-14
Christina Mchale (60)
Risa Ozaki (142)
Tokyo
R16
6-1 7-5
2015-09-14
Risa Ozaki (142)
Bojana Jovanovski (114)
Tokyo
R32
6-1 6-1
2015-07-27
Teliana Pereira (78)
Risa Ozaki (135)
Florianopolis
R16
6-4 6-1
2015-07-27
Risa Ozaki (135)
Andrea Gamiz (306)
Florianopolis
R32
6-7(8) 6-4 6-3
2015-07-20
Julia Goerges (57)
Risa Ozaki (137)
Bad Gastein
R32
6-3 6-4
2014-10-06
Yulia Putintseva (122)
Risa Ozaki (223)
Osaka
R32
7-6(3) 6-3
2013-12-30
Patricia Mayr Achleitner (92)
Risa Ozaki (193)
Shenzhen
R32
6-2 6-1
2013-09-23
Shuai Peng (37)
Risa Ozaki (196)
Tokyo
R64
6-2 6-1
2013-09-16
Annika Beck (53)
Risa Ozaki (200)
Seoul
R32
3-6 7-6(5) 6-4
2013-09-09
Nastassja Burnett (172)
Risa Ozaki (221)
Tashkent
R16
6-4 3-6 7-6(4)
2013-09-09
Risa Ozaki (221)
Kateryna Baindl (196)
Tashkent
R32
7-5 6-2