Stefanos Tsitsipas launched into a foul-mouthed rant during his United Cup defeat to Alexander Shevchenko, fuming that it was "impossible" to return on his backhand. The world No. 11 went down 6-4, 7-6 (0) in the biggest victory of Shevchenko's career to put Kazakhstan 1-0 up in Group C in the United Cup.

Iga Swiatek romped to an emphatic victory in her season-opening match at the United Cup Monday, but Stefanos Tsitsipas crashed as Kazakhstan upset Greece to make the knockout round of the mixed-team tournament.

Five-time Grand Slam winner Swiatek was on court for the first time since she served a one-month ban for a doping violation. Read more at straitstimes.com.

Iga Swiatek made a victorious return at the United Cup with a dominant win over Malene Helgo, after serving a one-month doping ban. In contrast, Stefanos Tsitsipas suffered a surprising loss to Alexander Shevchenko,