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Sayaka Ishii (石井さやか, Ishii Sayaka, born 31 August 2005) is a Japanese professional tennis player. She has career-high rankings of world No. 196 in singles, achieved on 30 December 2024, and No. 345 in doubles, achieved on 21 October 2024.
In July 2024, she and compatriot Naho Sato won the doubles title at the Figueira da Foz International Ladies Open. The following month, she made her WTA Tour debut after qualifying for Tennis in the Land. She lost to third seed Kateřina Siniaková in three sets. In October 2024, she qualified for her second main draw at the Toray Pan Pacific Open with a defeat over top qualifying seed Clara Tauson. She then recorded her first WTA Tour wins over compatriot and lucky loser Sara Saito and qualifier Zeynep Sönmez to reach her first WTA 500-level quarterfinal. Ishii withdrew with an abdominal injury before her last eight match with sixth seed Diana Shnaider. As a result, she reached a career-high ranking of No. 203 on 28 October 2024.
Grand Slam singles performance timeline
Key
W
F
SF
QF
#R
RR
Q#
P#
DNQ
A
Z#
PO
G
S
B
NMS
NTI
P
NH
(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.
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Ishii at the 2024 Cary Tennis Classic
Japan
Francesca Curmi
Iva Jovic
Stacey Fung
Lanlana Tararudee
Liu Fangzhou
Madeleine Brooks 
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