Highlights of 2018 Nitto ATP World Tour Finals day 7

Novak Djokovic of Serbia hits a return during the singles semifinal match against Kevin Anderson of South Africa during Day 7 of the 2018 Nitto ATP World Tour Finals at The O2 Arena in London, Britain on Nov. 17, 2018. Novak Djokovic won 2-0. (Xinhua/Han Yan)