The American and the Briton denied three set points on serve in the sixth game and locked the result at 3-3. Pegula struggled on serve again in the eighth game and got broken at 15 after Casper's smash winner, with the European squad forcing a match tie break.

Following her 7-5, 6-4 final win over Jasmine Paolini to earn her first Cincinnati Open title on Monday night, the world No. 2 took a private jet along with Carlos Alcaraz to New York to arrive in time for the U.S. Open mixed doubles tournament Tuesday.

Iga Swiatek hilariously cut off Casper Ruud and corrected him during their post-match interview following their US Open mixed doubles win. Swiatek and Ruud have teamed up for this year's US Open mixed doubles.

Iga Swiatek called out Casper Ruud after they booked their spot in Wednesday night’s US Open mixed doubles semi-final. The world No. 2 was in doubt to compete in the revamped tournament, winning her Cincinnati Open final the night before she was due to take to the court in Flushing Meadows.

Iga Swiatek on Tuesday shrugged off lingering weariness to partner Casper Ruud to back-to-back victories in the revamped mixed doubles competition at the US Open. Swiatek — who on Monday had battled through a two-hour tussle with Jasmine Paolini to win the Cincinnati Open — looked full of energy as she and Ruud powered into semi-finals.

Iga Swiatek, after a challenging start to the year, regained form by winning Wimbledon and Cincinnati, now a strong contender for the US Open title.

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Iga Swiatek has been "in bully mode" since Wimbledon, says Drew Dinsick, and he views her as the "short shot" over Aryna Sabalenka with a favorable outright price to win the US Open outright.