[caption id="attachment_119111" align="aligncenter" width="700"]
Rafael Nadal of Spain follows through on a shot during his match against Borna Coric of Croatia the first round of the U.S. Open Tennis tournament in New York, Monday, Aug. 31, 2015. (AP Photo/Kathy Willens)[/caption]
Rafael Nadal managed to win his first U.S. Open match since 2013, despite dropping a set along the way.
Nadal, who collected two of his 14 Grand Slam titles at Flushing Meadows, moved into the second round with a 6-3, 6-2, 4-6, 6-4 victory over 18-year-old Borna Coric of Croatia in Arthur Ashe Stadium.
The eighth-seeded Nadal missed last year's U.S. Open because of a right wrist injury. He won the tournament in 2010 and 2013.
Coric, ranked 33rd, is the youngest member of the ATP's top 50. He had won his only previous matchup with Nadal, which came last year.
On a muggy night, Rafael Nadal said he felt dehydrated, and that's why his level of play dropped for about a set.
"I had some problems. I was sweating a lot," Nadal said after beating 18-year-old Borna Coric in four sets in the U.S. Open's first round.
Nadal said he "had a little bit of (a) stomach problem" and wasn't "physically perfect," which is why he lost the third set, before feeling stronger in the fourth.
"I recovered (a) little bit. I played, again, more aggressive," Nadal added.
He said he doesn't think it was a big deal and shouldn't affect him Wednesday in the second round against Diego Schwartzman.