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Casper Ruud combined with Viktor Durasovic to win the doubles match wrap up the tie.
Spanish teenager Carlos Alcaraz claimed his first Grand Slam title and took the world number one ranking with a 6-4 2-6 7-6(1) 6-3 win over Norway's Casper Ruud in the U.S. Open final.
Fifth seed Ruud overcame Khachanov 7-6(5), 6-2, 5-7, 6-2 to reach his second Grand Slam championship match this year but said it took a Herculean effort after clinching the first-set tie-break in the longest rally of the tournament by far.