Dominic Thiem to face Stefanos Tsitsipas in ATP Finals showpiece after ousting Alexander Zverev

Dominic Thiem will play Stefanos Tsitsipas in Sunday's showpiece at the ATP Finals after beating reigning champion Alexander Zverev.The 26-year-old fought off two attempts at a break from his opponent to take the first set and eventually saw off the German 7-5, 6-3 in an hour and 34 minutes.