The Estonian improved to 7-0 in semifinals this year with a 6-1, 3-6, 6-3 victory over the Greek in Guadalajara.

The last time Sakkari lost to a Top 5 player was 22 months ago, when Naomi Osaka beat her in Brisbane.

The semifinal match-ups are now set in Guadalajara: Sakkari will square off against Anett Kontaveit, while Garbine Muguruza will take on Paula Badosa.

Monday's matches also feature five-time ATP Finals champ Novak Djokovic and WTA Finals top seed Aryna Sabalenka.

The Indian Wells champion will advance to the semifinals if Aryna Sabalenka wins a set against Iga Swiatek tonight.

Depending on the outcome of Saturday's matches in Guadalajara, one player could clinch Group Chichén Itzá while one competitor will be eliminated from the season finale.

The Greek gave Iga Swiatek an emotional hug following their match in Guadalajara.

The Greek star improved to 3-0 over the former Roland Garros champion, taking the early advantage in Group Chichén Itzá.

On Thursday in Guadalajara, Maria Sakkari can improve to 3-0 against Iga Swiatek, while Paula Badosa looks to build on her Cincinnati victory over Aryna Sabalenka.

Take our test on the sixth-ranked Greek—and take our other quiz see if your personality matches hers.