Jannik Sinner stumbles, then steps on gas in U.S. Open first round

(Photo credit: Robert Deutsch-USA TODAY Sports)
Top-seeded Jannik Sinner surprisingly dropped his first set of the U.S. Open before rallying for a 2-6, 6-2, 6-1, 6-2 win over Mackenzie McDonald in the first round Tuesday in New York.

McDonald, an American ranked No. 140 in the world, had the home crowd on his side as he broke the Italian's serve in an opening game that featured five break points. Sinner came back to tie