The mixed doubles duo of Maja Chwalińska and Jan Zieliński sealed the perfect victory for Team Poland, defeating the British pairing of Olivia Nicholls and Charles Broom 6-2, 7-6 in the final encounter of the match, Polish state news agency PAP reported.
Earlier, Poland's Hubert Hurkacz outplayed Britain's Billy Harris 7-6, 7-5 in the men's singles, and world No. 2 Iga Świątek defeated Britain's Katie Boulter 6-7, 6-1, 6-4 in the women's singles.
Poland will face Kazakhstan for a place in the final of the mixed-teams competition Down Under.
Poland beat Norway 2-1 in its first match at the United Cup tournament on Monday, and followed up with a 2-1 victory over the Czech Republic on New Year's Day.
The United Cup serves as a warm-up event for the Australian Open Grand Slam tournament, which is set to begin in Melbourne on January 12.
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Source: IAR, PAP, Polsat Sport