NEW YORK -- Spinning in 70 mph second serves, grabbing at his hamstring during points, Andy Murray gritted his way through head-to-toe cramps to win at the U.S. Open.

Murray outlasted Robin Haase 6-3, 7-6 (6), 1-6, 7-5 in the first round Monday during an afternoon that was hot but not particularly humid. He was mystified that the cramps came on so early -- at the start of the third set after only about an hour and a half on court.

"When it starts to kind of go everywhere, you don't know exactly where it's going to creep up next," he said. "When you stretch one muscle, something else then cramps, too."

It started in the back of his left shoulder, and then quickly spread to his forearm. The right-handed Murray couldn't toss the ball high enough to get any pace on his serves.

Between points, he'd twist his body to awkwardly stretch his left side. After hitting a winner, he'd reach for his quad.

Murray was twice down a break in the fourth set, but the 70th-ranked Haase unraveled with a string of unforced errors. He wasted three break points in the final game, when a missed call also cost him.

The eighth-seeded Murray had felt confident in his conditioning after productive training sessions in Miami, where he weathered far more heat and humidity than this. He wondered if something was amiss in his nutrition.

"Cramping in my left forearm?" a bewildered Murray said. "I mean, I didn't use my left forearm a whole lot today."


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No such struggles for top-seeded Novak Djokovic, who breezed past U.S. Open novice Diego Schwartzman 6-1, 6-2, 6-4. Djokovic wrapped up the final match on opening day at the year's last Grand Slam event as the hour grew late, with fans calling out to him from the faraway seats at Arthur Ashe Stadium.

"I hope it was a midnight delight for all you guys," he told them in an on-court interview.

Third-seeded Stan Wawrinka and fifth-seeded Milos Raonic both advanced in straight sets.

In women's play, fifth-seeded Maria Sharapova, who missed last year's tournament because of an injured right shoulder, made a successful return by winning the final 10 games to beat Maria Kirilenko 6-4, 6-0 in a matchup of 27-year-old Russians and longtime friends. Actor Alec Baldwin got into the action, too, catching an out-of-bounds shot that sailed over Sharapova and bounced into the seats.

Second-seeded Simona Halep rallied from a set down for a 6-7 (2), 6-1, 6-2 victory over 20-year-old Danielle Rose Collins, who was playing her first main draw match at a tour-level event. As a sophomore at Virginia, an unseeded Collins won the NCAA title to earn a wild card into the U.S. Open.