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In July 2024, she and compatriot ] won the ] title at the ].<ref>{{cite web |last1=Ribeiro Lança |first1=Gaspar |title=Sayaka Ishii e Naho Sato celebram lado a lado pela primeira vez na Figueira da Foz |url=https://www.raquetc.com/2024/07/27/sayaka-ishii-e-naho-sato-celebram-lado-a-lado-pela-primeira-vez-na-figueira-da-foz/ |website=Raquetc |access-date=29 July 2024 |language=pt |date=27 July 2024}}</ref> The following month, she made her ] debut after qualifying for ].<ref>{{cite web |last1=Smoliński |first1=Rafał |title=Kolejny turniej w stanie Ohio. Trudne zadanie obrończyni tytułu |url=https://sportowefakty.wp.pl/tenis/1141281/kolejny-turniej-w-stanie-ohio-trudne-zadanie-obronczyni-tytulu |website=] |access-date=19 August 2024 |language=pl |date=18 August 2024}}</ref> She lost to third seed ] in three sets.<ref>{{cite web |title=Siniakova saves three match points, escapes teenage qualifier Ishii |url=https://www.wtatennis.com/videos/4090166/siniakova-saves-three-match-points-escapes-teenage-qualifier-ishii |website=] |access-date=21 October 2024}}</ref> In October 2024, she qualified for the main draw of the WTA 500 ] with a defeat over top qualifying seed ], making her debut at this level. She then recorded her first WTA Tour wins over compatriot and lucky loser ] and qualifier ] to reach her first WTA Tour quarterfinal and also first at the 500-level. As a result she moved close to 90 positions in the rankings into the top 200.<ref>{{cite web |title=Tokyo Open: Ishii knocks out Saito |url=https://www.tennismajors.com/wta-tour-news/tokyo-open-ishii-books-spot-in-second-round-792013.html |website=Tennis Majors |access-date=23 October 2024 |date=22 October 2024}}</ref><ref>{{cite web |last1=Coskrey |first1=Jason |title=Leylah Fernandez into quarters in Tokyo as teen Sayaka Ishii continues impressive run |url=https://www.japantimes.co.jp/sports/2024/10/23/tennis/leylah-fernandez-pan-pacific/ |website=] |access-date=23 October 2024 |date=23 October 2024}}</ref>
In July 2024, she and compatriot ] won the ] title at the ].<ref>{{cite web |last1=Ribeiro Lança |first1=Gaspar |title=Sayaka Ishii e Naho Sato celebram lado a lado pela primeira vez na Figueira da Foz |url=https://www.raquetc.com/2024/07/27/sayaka-ishii-e-naho-sato-celebram-lado-a-lado-pela-primeira-vez-na-figueira-da-foz/ |website=Raquetc |access-date=29 July 2024 |language=pt |date=27 July 2024}}</ref> The following month, she made her ] debut after qualifying for ].<ref>{{cite web |last1=Smoliński |first1=Rafał |title=Kolejny turniej w stanie Ohio. Trudne zadanie obrończyni tytułu |url=https://sportowefakty.wp.pl/tenis/1141281/kolejny-turniej-w-stanie-ohio-trudne-zadanie-obronczyni-tytulu |website=] |access-date=19 August 2024 |language=pl |date=18 August 2024}}</ref> She lost to third seed ] in three sets.<ref>{{cite web |title=Siniakova saves three match points, escapes teenage qualifier Ishii |url=https://www.wtatennis.com/videos/4090166/siniakova-saves-three-match-points-escapes-teenage-qualifier-ishii |website=] |access-date=21 October 2024}}</ref> In October 2024, she qualified for the main draw of the WTA 500 ] with a defeat over top qualifying seed ], making her debut at this level. Ranked No, 279, she then recorded her first WTA Tour wins over compatriot and lucky loser ] and qualifier ] to reach her first WTA Tour quarterfinal and also first at the 500-level.<ref> {{cite web|url=https://www.tennis.com/news/videos/match-point-world-no-279-sayaka-ishii-demolishes-no-158-sara-saito-in-tokyo-first-round|title= MATCH POINT: WORLD NO. 279 SAYAKA ISHII DEMOLISHES NO. 158 SARA SAITO IN TOKYO FIRST ROUND|date= 22 October 2024}}</ref><ref> {{cite web|url=https://www.wtatennis.com/videos/4154340/japanese-qualifier-ishii-19-battles-past-sonmez-into-tokyo-quarters|title= 2024 TOKYO; Japanese qualifier Ishii, 19, battles past Sonmez into Tokyo quarters |date=23 October 2024 }} As a result she moved close to 90 positions in the rankings into the top 200.<ref>{{cite web |title=Tokyo Open: Ishii knocks out Saito |url=https://www.tennismajors.com/wta-tour-news/tokyo-open-ishii-books-spot-in-second-round-792013.html |website=Tennis Majors |access-date=23 October 2024 |date=22 October 2024}}</ref><ref>{{cite web |last1=Coskrey |first1=Jason |title=Leylah Fernandez into quarters in Tokyo as teen Sayaka Ishii continues impressive run |url=https://www.japantimes.co.jp/sports/2024/10/23/tennis/leylah-fernandez-pan-pacific/ |website=] |access-date=23 October 2024 |date=23 October 2024}}</ref>
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. 262 in singles, achieved on 16 September 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 the main draw of the WTA 500 Toray Pan Pacific Open with a defeat over top qualifying seed Clara Tauson, making her debut at this level. Ranked No, 279, she then recorded her first WTA Tour wins over compatriot and lucky loser Sara Saito and qualifier Zeynep Sönmez to reach her first WTA Tour quarterfinal and also first at the 500-level.Cite error: A <ref> tag is missing the closing </ref> (see the help page).