They both won 48 matches this year, and both became the first players from their respective countries, male or female, to reach the Top 10 on the ATP or WTA rankings.

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 No. 1 seed won the final seven points in edging the Pole, 2-6, 6-2, 7-5, to seal their Group Chichén Itzá clash Saturday night.

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 top seed is a wonder to watch at her very best; can she discover her peak form in her first WTA Finals appearance?

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.

Ahead of her WTA Finals campaign in Guadalajara, the world No.2 opened up about her experience in the California desert.

Based on how the 2021 season has played out, the 50th edition of the tour's season-ending championships in Guadalajara is full of possibilities—expected and otherwise.

A full Mariachi band awaited Mexico's Giuliana Olmos, Maria Sakkari, Iga Swiatek and Aryna Sabalenka at the airport.