2014 US OPEN: Kvitova(3) Shocked By Qualifier Krunic; Sharapova(5) Ousted By Resurgent Wozniacki

It's been an exciting weekend at the 2014 US Open so far with the disappearance of two major champions from the women's side of the draw. On Saturday, Serbian qualifier Miranda Krunic followed up her earlier upset of hard-hitting American teenager Madison Keys with an even more improbable straight sets 6-4 6-4dismissal of the reigning Wimbledon champion Petra Kvitova to reach the 4th round of a major tournament.

Later on that day Serena Williams held off a stiff challenge from Varvara Lepchenko, doing well to win in straight sets 6-3 603 in very difficult, windy conditions.

Then on Sunday, the reigning French Open champion Maria Sharapova was ousted in three very entertaining sets 6-4 2-6 6-2 by a very determined Caroline Wozniacki. Wozniacki will next play Sara Errani and the former World #1 has a very good chance to reach her 3rd U.S. Open final in five years thanks to the upsets which have plagued the bottom half of the draw.

The first big upset occurred on the Men's Side on Sunday with #4 seed David Ferrer losing to Gilles Simon. This could potentially be bad news for Roger Federer, who has never lost to Ferrer but has often struggled against the Frenchman Simon, if both players reach the semifinals by winning their next two matches.