Dominic Thiem beats Tsitsipas in ATP Finals opener

Dominic Thiem beat Stefanos Tsitsipas in the opening singles match of the ATP Finals on Sunday as Rafael Nadal prepared to launch his bid for a first title at the elite eight-man event. In a repeat of last year's final at London's O2 Arena, won by Tsitsipas, US Open champion Thiem stumbled after winning a first-set tie-break but...