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LONDON, Nov. 11 (Xinhua) -- Following are the singles results on the second day of the ATP Finals at London's O2 Arena on Monday (prefix denotes seeding):
Singles
Group Andre Agassi
6-Stefanos Tsitsipas, Greece, bt 4-Daniil Medvedev, Russia, 7-6 (7/5), 6-4
7-Alexander Zverev, Germany, bt 1-Rafael Nadal, Spain, 6-2, 6-4
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