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,

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

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.