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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. 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 }}</ref> 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> |
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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. Ranked No, 279, she then recorded her first WTA Tour wins over compatriot and lucky loser ]<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/4153546/teenage-qualifier-ishii-earns-first-career-tour-level-win-in-tokyo|title= 2024 TOKYO; Teenage qualifier Ishii earns first career tour-level win in Tokyo |date=22 October 2024}}</ref> and qualifier ] to reach her first WTA Tour quarterfinal and also first at the 500-level.<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 }}</ref> 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> |