On verge of his biggest title, Isner to face Zverev in Miami

KEY BISCAYNE, Fla. (AP) — After John Isner clinched his berth in the Miami Open final, he came over the top one last time, throwing a celebratory punch at a speed to match his thunderous serve.

The towering American moved one step closer to the most prestigious title of his 14-year career by beating a weary Juan Martin del Potro 6-1, 7-6 (2) in Friday's semifinals.

"I'm playing the best tennis I've played in a very, very long time," said Isner, 32. "And I'm so happy to be doing it here."

Dominating with his serve and aggressive baseline strokes, the 6-foot-10 Isner ended a 15-match winning streak for del Potro, who won Indian Wells two weeks ago by beating Roger Federer in the final.