No. 4-seed Alexander Zverev lost in the second round of the U.S. Open on Wednesday evening, falling Croatia's Borna Coric 6-3, 5-7, 6-7, 6-7 on the Grandstand court.
20-year-old Zverev, a favorite to make a deep run at the U.S. Open and an ATP rising star, played a late first round match on Monday night that ended after 2 a.m.