Highlights of 2018 Nitto ATP World Tour Finals day 7

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