Carlos Alcaraz, of Spain, celebrates after defeating Novak Djokovic, of Serbia, during the men's singles semifinals of the U.S. Open tennis championships, on Friday.

Carlos Alcaraz used his youth, athleticism and creativity to assert himself against the much more accomplished, but also much older, Novak Djokovic and beat the 24-time major champion 6-4, 7-6 (4), 6-2 at the U.S. Open on Friday for a berth in his third consecutive Grand Slam final.

By the end, Djokovic was “gassed out,” as he described it afterward, and seemed resigned to the result. The 38-year-old from Serbia reached the semifinals at all four Slams this season but exited in that round each time, three via losses to No. 2 Alcaraz, 22, or No. 1 Jannik Sinner, 24.

“It’s frustrating on the court when you are not able to kee

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