A dominant United States lifted their second United Cup mixed team tournament title in three years after they beat Poland 2-0 on Sunday with Coco Gauff and Taylor Fritz both winning their singles matches.

Coco Gauff defeated Iga Swiatek to give the USA a 1-0 lead and Taylor Fritz edged Hubert Hurkacz in a third-set tiebreak to deliver the United Cup title.

Former champions the United States returned to the final of the United Cup mixed team tournament with a fortuitous victory over the Czech Republic on Saturday and set up a title clash with Poland, who hammered Kazakhstan.

Iga Swiatek powers Poland past Kazakhstan to set up a United Cup final against the United States following their victory over the Czech Republic.

The United States have won the United Cup for the second time after defeating Poland in the final on Sunday. Coco Gauff began in style in Sydney with a 6-4, 6-4 win over world number two Iga Swiatek,

Top-seeded United States and No. 2 seed Poland will meet Sunday in the United Cup final in Sydney. Coco Gauff and Taylor Fritz topped the Czech team of Karolina Muchova and Tomas Machac on Saturday to advance.

Tomas Machac unleashed on his coach, threw his racket and struck his bag in anger during an extended on-court meltdown in Czechia's semi-final loss to the US.