Highlights of 2018 Nitto ATP World Tour Finals day 7

Alexander Zverev of Germany hits a return during the singles semifinal match against Roger Federer of Switzerland during Day 7 of the 2018 Nitto ATP World Tour Finals at The O2 Arena in London, Britain on Nov. 17, 2018. Alexander Zverev won 2-0. (Xinhua/Han Yan)