Alexei Popyrin stuns Novak Djokovic in 3rd round at U.S. Open
The U.S. Open men's singles field was blown open on Friday when Alexei Popyrin upset defending champion Novak Djokovic 6-4, 6-4, 2-6, 6-4 in third-rouThe U.S. Open men's singles field was blown open on Friday when Alexei Popyrin upset defending champion Novak Djokovic 6-4, 6-4, 2-6, 6-4 in third-rou