Iga Swiatek refused to reveal what she spoke to Katie Boulter about following their three-hour thriller at the United Cup. The British No. 1 caused all sorts of trouble for the five-time Major winner as they faced off in the second match of the Poland vs GB quarter-final but Swiatek still came out on top.

Iga Swiatek battles through exhaustion to secure a crucial win for Poland at the United Cup, advancing to the semifinals where she’ll face Kazakhstan.

Poland returned to the semi-finals of the United Cup mixed team tournament for a third successive year after hard-fought singles victories in Sydney handed them an unassailable 2-0 lead over Britain on Thursday.

Katie Boulter gave world No.2 Iga Swiatek a huge scare before losing a “crazy” encounter at the United Cup. The British No.1 went a break up in the final set of a rollercoaster match - and then had a break point at 4-4 to serve for the biggest win of her career.

Iga Swiatek survived a two-hour and 57-minute thriller against Katie Boulter after completing a 6-7 (3) 6-1 6-4 win at the United Cup to help Poland seal a semifinal ticket at the event.

Iga Swiatek came from a break down in the final set to best Katie Boulter in a three-hour epic to deliver Poland to the semifinals at the United Cup in Sydney.

The British number one had a break point at 4-4 in the deciding set against Poland’s five-time grand slam winner.

World No.2 Iga Swiatek notched a hard-fought 6-3, 6-4 victory over the Czech Republic's Karolina Muchova at the United Cup in Sydney on New Year’s Day and Poland secured a 2-1 victory to finish atop Group B.

Highlights of the United Cup tie between Katie Boulter and Iga Switaek.