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.

Iga Swiatek is off and running. The former No.1 dropped just one game against Malene Helgø in her first match of the new season, giving Poland an early lead over Norway at the Untied Cup in Sydney.

There are still three spots up for grabs for the quarterfinals of the United Cup and five teams are in contention. This article features the blockbuster tie between Poland and Czechia, the winner will top the group.

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,

Iga Swiatek of Poland returned from her doping ban with a thrashing of Norway's Malene Helgo as Greece's Stefanos Tsitsipas lost to Alexander Shevchenko of Kazakhstan in the United Cup.