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Fernando Gonzalez


NEW YORK -- For one set Thursday, Marin Cilic frolicked on the Arthur Ashe Stadium court. He hit crazy, curving backhands and had sixth-seeded Juan Martin del Potro muttering under his breath.

But there was a second set. It was then that del Potro found his game on a gloomy afternoon where the wind played tricks with the ball. Del Potro did too, moving Cilic from side to side. By the end, Cilic was left slapping aimless volleys into the net and making useless challenges to balls well wide.

The sixth-seeded del Potro, a 20-year-old from Argentina, made it to his second major tournament semifinal with his 4-6, 6-3, 6-2, 6-1 victory over the 16th-seeded Croatian Cilic, who is...