NEW YORK—As the losses piled up and titles escaped him, Roger Federer insisted he felt fine, he wasn’t washed up and his game would come around.

Oh, did Federer look good against Novak Djokovic in the U.S. Open semifinals.

Buoyed by a stellar start and a fantastic finish in a rematch of last year’s final, Federer beat Djokovic 6-3, 5-7, 7-5, 6-2 Saturday to move within one victory of a fifth consecutive U.S. Open championship and 13th Grand Slam title overall.

“One more match is all I need,” he said.

He wasn’t going to go to bed knowing the name ...

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