Thiem beats Tsitsipas in 3 sets in ATP Finals opener

Dominic Thiem made sure this year's ATP Finals didn't begin the same way last year's ended. Thiem outlasted Stefanos Tsitsipas in a rematch of the 2019 final, beating the defending champion 7-6 (5), 4-6, 6-3 Sunday in the opening singles match of the tournament inside a largely empty O2 Arena. The U.S. Open champion broke Tsitsipas for a 2-0 lead in the third set with a drop shot at the net and converted his second match point when Tsitsipas sent a forehand wide.