Former world number one Serena Williams slid out of the Italian Open following a 6-3 2-6 7-6 defeat by Patty Schnyder in the quarter-finals on Friday.
Russia's Anastasia Myskina and Elena Dementieva made a fourth round exit from the Australian Open.
Twelfth seed Patty Schnyder of Switzerland fought back to upset sixth seed Elena Dementieva 6-7, 7-6, 6-2 to reach the quarter-finals.
New world number one Amelie Mauresmo struggled to a 7-5, 6-4 victory over Patty Schnyder in the second round of the Filderstadt Grand Prix.
The Frenchwoman won an epic battle with 12th seed Patty Schnyder 5-7, 6-1, 7-5 on Wednesday.
Former champion Maria Sharapova found inspiration in a change of dress to put away unseeded American Lauren Davis 6-1, 6-7(5), 6-0 at the Australian Open on Friday and set up an intriguing fourth round match with rising Swiss talent Belinda Bencic.
'Everyone always talks about how hot Melbourne is but the US Open's way worse'
Images from Day 4 of the US Open in New York on Thursday.