Highlights of 2018 Nitto ATP World Tour Finals day 7

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Novak Djokovic of Serbia celebrates victory after 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)