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. Although the 24th-ranked Briton entered as the underdog,

Katie Boulter fell short of a stunning win over five-time Grand Slam champion Iga Swiatek as Britain's hopes of reaching the United Cup semi-finals are ended by Poland.

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.

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.

Iga Swiatek has overcome an evident injury problem to help Poland power past Great Britain and make the semi-finals of the United Cup.

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.