Wimbledon champion Simona Halep's New York frustrations continued as the Romanian fourth seed suffered a shock 2-6 6-3 7-6(4) loss to American qualifier Taylor Townsend in second round action on Thursday.
Halep, who fell in the first round here in the last two years, managed to fight off a pair of match points in the 10th game of the decider but Townsend's aggressive play at the net carried her home.
Townsend, 23, used an aggressive, net-rushing style of play to kept the pressure on Halep, who grew more and more frustrated as she was unable to come up with the necessary passing shots.
Halep arrived at Flushing Meadows looking to become the first woman since Serena Williams in 2012 to follow a Wimbledon win with a U.S. Open triumph.
Up next for Townsend in her first third round appearance at the U.S. Open, will be Romanian Sorana Cirstea, who beat Spain's Aliona Bolsova earlier on Thursday.