WATCH: Madison Keys hits brilliant winner in maiden WTA Finals victory

Keys beat Cibulkova, 6-1, 6-4, to improve to 1-1 in the Red Group. 

Elina Svitolina complains of online abuse from Russians in Moscow

"It was a very tough tournament, and I don't think I will come back," she said. 

Kuznetsova chops hair, cuts down No. 3 Radwanska in WTA Finals stunner

Sveta, who barely made the cut for Singapore, beat the world No. 3 in 2:48, 7-5, 1-6, 7-5.

Gael Monfils qualifies for ATP Tour Finals for first time

Berdych, Goffin and Cilic are competing for the final two spots. 

Muguruza blows golden opportunity against Pliskova in Singapore

The Spaniard led 4-0 in the third set and squandered a match point. 

Tennis Podcast

Final Thoughts on Kyrgios; First Look at WTA Finals

Steve Tignor and Ed McGrogan dig into a busy week of tennis news, on and off the court.