ATP FINALS: 2019 FINALIST THIEM OUTLASTS DJOKOVIC IN TENSE SEMI

© Getty Images Dominic Thiem at the ATP Finals Dominic Thiem booked his place in a second successive ATP Finals showdown as he overcame four-time champion Novak Djokovic in a magnificent clash on Saturday.Thiem defeated Djokovic in three sets en route to the 2019 final, which he lost to Stefanos Tsitsipas, but the US Open champion let four match points slip in the second set in London t...