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Marin Cilic of Croatia reacts during the singles group match against Alexander Zverev of Germany during the Nitto ATP World Tour Finals at O2 Arena in London, Britain on Nov. 12, 2017. Alexander Zverev won 2-1. (Xinhua/Han Yan)
Marin Cilic of Croatia reacts during the singles group match against Alexander Zverev of Germany during the Nitto ATP World Tour Finals at O2 Arena in London, Britain on Nov. 12, 2017. Alexander Zverev won 2-1. (Xinhua/Han Yan)