United Cup: Iga Swiatek survives thriller with Jan Zielinski in mixed doubles decider

Iga Swiatek was Poland's hero in their opening match at the United Cup as the five-time Grand Slam champion won a mixed doubles thriller with Jan Zielinski to lead her nation to a 1-0 start in Sydney.On Monday, the second-ranked WTA player destroyed Norway's Malene Helgo 6-1 6-0 in the opening rubber of the tie.Then, Hubert Hurkacz had a chance to seal the deal for Poland but failed to do so after losing to Casper Ruud in the following singles match.As a result, Swiatek had to return t