In her career, Ozaki won seven singles titles on the ITF Women's Circuit. On 24 April 2017, she reached her best singles ranking of world No. 70. On 6 March 2017, she peaked at No. 246 in the WTA doubles rankings.
Ozaki made her WTA Tour debut at the 2013 Tashkent Open, having entered the qualifying tournament and defeating Veronika Kapshay and Ksenia Palkina for a spot in the main draw. She was thereby pitted against fellow qualifier Kateryna Kozlova and defeated the Ukrainian in straight sets, simultaneously recording her first main-draw win at the WTA Tour-level. She was subsequently beaten in the second round by Nastassja Burnett in a final-set tiebreak.
(W) winner; (F) finalist; (SF) semifinalist; (QF) quarterfinalist; (#R) rounds 4, 3, 2, 1; (RR) round-robin stage; (Q#) qualification round; (P#) preliminary round; (DNQ) did not qualify; (A) absent; (Z#) Davis/Fed Cup Zonal Group (with number indication) or (PO) play-off; (G) gold, (S) silver or (B) bronze Olympic/Paralympic medal; (NMS) not a Masters tournament; (NTI) not a Tier I tournament; (P) postponed; (NH) not held; (SR) strike rate (events won / competed); (W–L) win–loss record.
To avoid confusion and double counting, these charts are updated at the conclusion of a tournament or when the player's participation has ended.
Only main-draw results in WTA Tour, Grand Slam tournaments, Fed Cup/Billie Jean King Cup and Olympic Games are included in win–loss records.
^The first Premier 5 event of the year has switched back and forth between the Dubai Tennis Championships and the Qatar Ladies Open since 2009. Dubai was classified as a Premier 5 event from 2009 to 2011 before being succeeded by Doha for the 2012–2014 period. In 2015, Dubai regained its Premier 5 status while Doha was demoted to Premier status. The Premier 5 tournaments were reclassified as WTA 1000 tournaments in 2021.