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

The top seeds in the US$10 million tournament that began with 18 nations in contention clinched the trophy when Fritz defeated Hubert Hurkacz 6-4 5-7 7-6(4), after Coco Gauff outclassed Iga Swiatek 6-4, 6-4 in Sydney.

The Americans had also won the 2023 title in the inaugural edition of the tournament, which serves as a tune-up event for the Australian Open Grand Slam.

With the second singles contest locked at one set apiece, Fritz raised his level at 3-3 in the tiebreak of the decider to see off Hurkacz and spark huge celebrations.

Gauff earlier stepped up preparations for the year's first major that begins next Sunday with a second successive win over world number two Swiatek in a blockbuster showdown that gave fans at the Ken Rosewall Arena their money's worth.

The world number three, who beat Swiatek en route to the WTA Finals title last season, squandered a 2-0 lead in the first set but battled back from there to gain the upper hand in the match as her opponent counted the costs of 19 unforced errors.

In another high-octane set that followed, Gauff recovered a break to level at 4-4 and went on to secure the win that ensured she ended her singles campaign at the tournament unbeaten. (Reuters)