Bulgaria’s Grigor Dimitrov (R) embraces Austria’s Dominic Thiem after his three-set victory on day two of the ATP World Tour Finals tennis tournament at the O2 Arena in London on November 13, 2017. Glyn KIRK / AFPGrigor Dimitrov held his nerve to launch his ATP Finals campaign with a 6-3, 5-7, 7-5 victory over Dominic Thiem on Monday, as Rafael Nadal prepared to start his quest for the biggest title missing from his impressive collection.

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