LONDON: Nikola Mektic and Wesley Koolhof won their opening match in the doubles event of the 2020 ATP Finals on Sunday against Kevin Krawietz and Andreas Mies 6-7 (3), 7-6 (4), 10-7 at the O2 Arena. In the first match of men's singles, Dominic Thiem and Stefanos Tsitsipas were at level by claiming on set each when report last came in. Thiem took the firts set in tie-break 7-5 while Tsitsipas came back strongly in the second with 6-4. However Thiem was leading in the final set by 3-1 games.