In oppressively humid conditions at Flushing Meadows, Simon and Ferrer traded the first two sets 6-3 before Simon found another level to wrap up the final two sets 6-1, 6-3
Simon, who’s seeded 26th, took advantage of some sloppy play by Ferrer, who made 52 unforced errors and appeared to be struggling physically with the heat
Meanwhile Caroline Wozniacki put a nightmare 2014 firmly behind her by knocking out five time grand slam winner Maria Sharapova 6-4, 2-6, 6-2 and book her place in the quarter finals.
Sharapova is the reigning French Open champion and was the strong favorite at the Arthur Ashe Stadium.