2021 WTA Finals – Singles

Garbiñe Muguruza defeated Anett Kontaveit in the final, 6–3, 7–5 to win the singles tennis title at the 2021 WTA Finals. It was her 10th and last career WTA Tour title.

Ashleigh Barty was the reigning champion from when the event was last held in 2019, but withdrew to prioritize her recovery and prepare for the upcoming season.

Aryna Sabalenka, Barbora Krejčíková, Maria Sakkari, Iga Świątek, Paula Badosa, and Kontaveit made their singles debuts at the event.

Seeds
• # 🇧🇾 Aryna Sabalenka (round robin)

• # 🇨🇿 Barbora Krejčíková (round robin)

• # 🇨🇿 Karolína Plíšková (round robin)

• # Maria Sakkari (semifinals)

• # 🇵🇱 Iga Świątek (round robin)

• # 🇪🇸 Garbiñe Muguruza (champion)

• # 🇪🇸 Paula Badosa (semifinals)

• # 🇪🇪 Anett Kontaveit (final)

Alternates
• # 🇺🇸 Jessica Pegula (Did not play)

• # 🇧🇪 Elise Mertens (Did not play) Notes:
 * Ons Jabeur, Naomi Osaka, Anastasia Pavlyuchenkova, and Elina Svitolina all qualified as alternates but withdrew before the start of the event

Group Teotihuacán
''Standings are determined by: 1. number of wins; 2. number of matches; 3. in two-player ties, head-to-head records; 4. in three-player ties, (a) percentage of sets won (head-to-head records if two players remain tied), then (b) percentage of games won (head-to-head records if two players remain tied), then (c) WTA rankings.''