Djokovic improves to 19-0 in the first round of the US Open, wins his first match since Wimbledon

Novak Djokovic improved to 19-0 in the first round of the U.S. Open, battling through some leg troubles to beat Learner Tien 6-1, 7-6 (3), 6-2 on Sunday night. Djokovic had his hands on his knees multiple times in the second set and received treatment on his right big toe after it. The No. 7-seeded Djokovic has made a career of wearing down his opponents, but he looked like the one who was feeling it physically in the second set against an opponent who was half his age.