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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=] |date=21 August 2024 |access-date=21 October 2024}}</ref> In October 2024, she qualified for her second main draw at the ] with a defeat over top qualifying seed ]. She then recorded her first WTA Tour wins over compatriot and lucky loser ]<ref>{{cite web |title=MATCH POINT: World No. 279 Sayaka Ishii demolishes No. 158 Sara Saito in Tokyo first round |url=https://www.tennis.com/news/videos/match-point-world-no-279-sayaka-ishii-demolishes-no-158-sara-saito-in-tokyo-first-round |website=] |access-date=23 October 2024 |date=22 October 2024}}</ref><ref>{{cite web |title=Teenage qualifier Ishii earns first career tour-level win in Tokyo |url=https://www.wtatennis.com/videos/4153546/teenage-qualifier-ishii-earns-first-career-tour-level-win-in-tokyo |website=] |access-date=23 October 2024 |date=22 October 2024}}</ref><ref>{{cite web|url=https://www.tennismajors.com/wta-tour-news/tokyo-open-ishii-books-spot-in-second-round-792013.html|title=Tokyo: Ishii books spot in second round|website=Tennis Majors |access-date=22 October 2024 |date=22 October 2024}}</ref> and qualifier ] to reach her first WTA 500-level quarterfinal.<ref>{{cite web |title=Japanese qualifier Ishii, 19, battles past Sonmez into Tokyo quarters |url=https://www.wtatennis.com/videos/4154340/japanese-qualifier-ishii-19-battles-past-sonmez-into-tokyo-quarters |website=] |access-date=23 October 2024 |date=23 October 2024}}</ref><ref>{{cite web |title=Andreescu advances to Tokyo quarters as Haddad Maia retires due to injury |url=https://www.wtatennis.com/news/4154366/andreescu-advances-to-tokyo-quarters-as-haddad-maia-retires-due-to-injury |website=] |access-date=23 October 2024 |date=23 October 2024}}</ref><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> Ishii withdrew with an abdominal injury before her last eight match with sixth seed ].<ref>{{cite news|url=https://www.reuters.com/sports/tennis/wta-roundup-sofia-kenin-upsets-daria-kasatkina-tokyo-2024-10-25/|title=WTA roundup: Sofia Kenin upsets Daria Kasatkina in Tokyo|date=25 October 2024|publisher=]|accessdate=25 October 2024}}</ref><ref>{{cite web|url=https://www.tennismajors.com/wta-tour-news/tokyo-open-shnaider-reaches-last-four-792837.html|title=Tokyo Open: Shnaider reaches last four|publisher=Tennis Majors|date=25 October 2024|accessdate=25 October 2024}}</ref><ref>{{cite web|last=Nakamoto|first=Morichika|url=https://english.kyodonews.net/news/2024/10/067aff4e78ab-tennis-japanese-teen-ishii-withdraws-from-pan-pacific-open-qfinals.html|title=Tennis: Japanese teen Ishii withdraws from Pan Pacific Open q'finals|date=25 October 2024|publisher=]|access-date=27 October 2024}}</ref> As a result, she reached a career-high ranking of No. 203 on 28 October 2024.<ref>{{cite web |last=Macpherson |first=Alex |url=https://www.wtatennis.com/news/4157834/rankings-watch-kenin-danilovic-surge-four-new-career-highs-in-top-20 |title=Rankings Watch: Kenin, Danilovic surge; four new career highs in Top 20 |date=28 October 2024 |website=] |access-date=7 January 2025}}</ref>
===2024: WTA Tour debut and maiden quarterfinal, top 250===
In July, 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=] |date=21 August 2024 |access-date=21 October 2024}}</ref> In October, she qualified for her second main draw at the ] with a defeat over top qualifying seed ]. She then recorded her first WTA Tour wins over compatriot and lucky loser ]<ref>{{cite web |title=MATCH POINT: World No. 279 Sayaka Ishii demolishes No. 158 Sara Saito in Tokyo first round |url=https://www.tennis.com/news/videos/match-point-world-no-279-sayaka-ishii-demolishes-no-158-sara-saito-in-tokyo-first-round |website=] |access-date=23 October 2024 |date=22 October 2024}}</ref><ref>{{cite web |title=Teenage qualifier Ishii earns first career tour-level win in Tokyo |url=https://www.wtatennis.com/videos/4153546/teenage-qualifier-ishii-earns-first-career-tour-level-win-in-tokyo |website=] |access-date=23 October 2024 |date=22 October 2024}}</ref><ref>{{cite web|url=https://www.tennismajors.com/wta-tour-news/tokyo-open-ishii-books-spot-in-second-round-792013.html|title=Tokyo: Ishii books spot in second round|website=Tennis Majors |access-date=22 October 2024 |date=22 October 2024}}</ref> and qualifier ] to reach her first WTA 500-level quarterfinal.<ref>{{cite web |title=Japanese qualifier Ishii, 19, battles past Sonmez into Tokyo quarters |url=https://www.wtatennis.com/videos/4154340/japanese-qualifier-ishii-19-battles-past-sonmez-into-tokyo-quarters |website=] |access-date=23 October 2024 |date=23 October 2024}}</ref><ref>{{cite web |title=Andreescu advances to Tokyo quarters as Haddad Maia retires due to injury |url=https://www.wtatennis.com/news/4154366/andreescu-advances-to-tokyo-quarters-as-haddad-maia-retires-due-to-injury |website=] |access-date=23 October 2024 |date=23 October 2024}}</ref><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> Ishii withdrew with an abdominal injury before her last eight match with sixth seed ].<ref>{{cite news|url=https://www.reuters.com/sports/tennis/wta-roundup-sofia-kenin-upsets-daria-kasatkina-tokyo-2024-10-25/|title=WTA roundup: Sofia Kenin upsets Daria Kasatkina in Tokyo|date=25 October 2024|publisher=]|accessdate=25 October 2024}}</ref><ref>{{cite web|url=https://www.tennismajors.com/wta-tour-news/tokyo-open-shnaider-reaches-last-four-792837.html|title=Tokyo Open: Shnaider reaches last four|publisher=Tennis Majors|date=25 October 2024|accessdate=25 October 2024}}</ref><ref>{{cite web|last=Nakamoto|first=Morichika|url=https://english.kyodonews.net/news/2024/10/067aff4e78ab-tennis-japanese-teen-ishii-withdraws-from-pan-pacific-open-qfinals.html|title=Tennis: Japanese teen Ishii withdraws from Pan Pacific Open q'finals|date=25 October 2024|publisher=]|access-date=27 October 2024}}</ref> As a result she reached a new career-high,three spots shy of thetop 200 on 28 October 2024 raising close to 80 positions up in the singles rankings, having been ranked No. 279 in the beginning of the tournament.<ref>{{cite web|url=https://www.wtatennis.com/news/4157834/rankings-watch-kenin-danilovic-surge-four-new-career-highs-in-top-20|title=Rankings Watch: Kenin, Danilovic surge; four new career highs in Top 20|date=28 October 2024|website=WTATennis}}</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. 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.