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Sayaka Ishii
Sayaka Ishii
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Sayaka Ishii

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. 188 in singles, achieved on 17 March 2025, and No. 285 in doubles, achieved on 19 May 2025.

Key Information

Early life

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Ishii was born in Shibuya, Tokyo.[1] Her father, Takuro Ishii, is a former professional baseball player, and her mother, Shiori Arase [ja], is a former Fuji Television announcer.[2] She trained at the IMG Academy in Bradenton, Florida.[3]

Junior career

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In 2022, she reached the final of the Osaka Mayor's Cup, but lost to compatriot Sara Saito.[4]

Professional career

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In July 2024, she and compatriot Naho Sato won the doubles title at the Figueira da Foz International Ladies Open.[5] The following month, she made her WTA Tour debut after qualifying for Tennis in the Land, but lost to third seed Kateřina Siniaková in three sets.[6][7] 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[8][9][10] and qualifier Zeynep Sönmez to reach her first WTA 500-level quarterfinal.[11][12][13][14] Ishii withdrew with an abdominal injury before her last eight match with sixth seed Diana Shnaider.[15][16][17] As a result, she reached a career-high ranking of No. 203 on 28 October 2024.[18]

In March 2025, she received a wildcard into the main draw of the Miami Open, but lost in the first round to Emma Raducanu.[19][20]

Performance timelines

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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.

Only main-draw results in WTA Tour, Grand Slam tournaments, Billie Jean King Cup, United Cup, Hopman Cup and Olympic Games are included in win–loss records.

Singles

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Current through the 2025 Miami Open.

Tournament 2025 SR W–L Win%
Grand Slam tournaments
Australian Open Q2 0 / 0 0–0  – 
French Open 0 / 0 0–0  – 
Wimbledon 0 / 0 0–0  – 
US Open 0 / 0 0–0  – 
Win–loss 0–0 0 / 0 0–0  – 
WTA 1000 tournaments
Miami Open 1R 0 / 1 0–1 0%
Win–loss 0–1 0 / 1 0–1 0%

ITF Circuit finals

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Singles: 3 (1 title, 2 runner–ups)

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Legend
W25/35 tournaments (1–1)
W15 tournaments (0–1)
Finals by surface
Hard (1–2)
Result W–L    Date    Tournament Tier Surface Opponent Score
Loss 0–1 Jun 2022 ITF Monastir, Tunisia W15 Hard Malta Francesca Curmi 2–6, 6–4, 5–7
Loss 0–2 Oct 2023 ITF Redding, US W25 Hard United States Iva Jovic 4–6, 2–6
Win 1–2 Apr 2024 ITF Osaka, Japan W35 Hard Canada Stacey Fung 6–1, 3–6, 6–3

Doubles: 2 (1 title, 1 runner-up)

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Legend
W100 tournaments (1–0)
W35 tournaments (0–1)
Finals by surface
Hard (1–1)
Result W–L    Date    Tournament Tier Surface Partner Opponents Score
Loss 0–1 Feb 2024 ITF Traralgon, Australia W35 Hard Thailand Lanlana Tararudee Japan Mana Kawamura
China Liu Fangzhou 		7–6(4), 3–6, [11–13]
Win 1–1 Jul 2024 Figueira da Foz Open, Portugal W100 Hard Japan Naho Sato United Kingdom Madeleine Brooks
United Kingdom Sarah Beth Grey 		7–6(1), 7–5

References

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