NEW YORK — Taylor Fritz surged with a six-game run against a fading and frustrated Frances Tiafoe to come out on top 4-6, 7-5, 4-6, 6-4, 6-1 in an all-American matchup at the U.S. Open on Friday night to reach his first Grand Slam final.

The No. 12-seeded Fritz’s momentum-shift-filled victory against No. 20 Tiafoe from Hyattsville — a pair of 26-year-olds who are close pals and have known each other since they were playing in tournaments for kids younger than 14 — earned a showdown against No. 1 Jannik Sinner for the championship on Sunday.

Fritz will be the first U.S. man to appear in a major final since Andy Roddick lost to Roger Federer at Wimbledon in 2009. If he can get past Sinner, Fritz would become the first U.S. man to win a Slam trophy since Roddick got his 21 years ago at the U.S. Open.

From 4-all in the fourth set Friday, Fritz seized control as Tiafoe’s strokes and usual confidence betrayed him. After a double-fault handed over a break to make it 4-0 in the fifth, more than three hours into the proceedings, Tiafoe chucked his racket. Fritz repaid the favor by double-faulting to end the next game but broke right back and soon it was over.

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Sinner, a 23-year-old from Italy exonerated in a doping case less than three weeks ago, finished a 7-5, 7-6 (3), 6-2 victory over No. 25 Jack Draper earlier Friday that featured simultaneous treatment of both competitors by trainers deep in the 1 1/2-hour second set.

“It was a very physical match, as we see,” said Sinner, who won the Australian Open in January. “I just tried to stay there mentally.”