WTA Finals: Serena Williams achieves three-peat; beat Simona Halep 6–3, 6–0 in final

Katarina Srebotnik of Slovenia plays a forehand against Sara Errani and Roberta Vinci of Italy during their doubles quarter-final match on day 5 of the WTA Finals. Srebotnik and her doubles partner, Kveta Peschke of Czech Republic, advanced to the semi-final by virtue of Errani’s retirement from the match. (Photo 42 © Lim Yong Teck/Red Sports)