Women's singles second seed Agnieszka Radwanska and sixth seed Simona Halep lost their Round of 16 matches on a rain-hit day at the French Open.
Radwanska will face China's Li Na for a place in the semi-finals.
Bulgaria's Tsvetana Pironkova pulled off a surprise win against a sick Varvara Lepchenko of the US here in the Kremlin Cup on Tuesday.
More than four years after her French Open title, Ana Ivanovic is finally back in a Grand Slam quarterfinal.
Maria Sharapova has backed to plans to silence tennis grunters even though the world number one is one of the worst offenders.
World number one Maria Sharapova was forced to dig deep before securing her place in the Wimbledon third round with a 7-6 (7/3), 6-7 (3/7), 6-0 victory over Bulgaria's Tsvetana Pironkova on Thursday.
World number one Maria Sharapova swept into the Wimbledon second round with a 6-2, 6-3 victory over Australia's Anastasia Rodionova on Monday.
Anna Tatishvili of Georgia upset third-seeded Tsvetana Pironkova of Bulgaria 1-6, 6-3, 6-1 Monday in the first round of the Budapest Grand Prix.
India's challenge in the singles event of the season's first Grand Slam was over in just an hour and 28 minutes as Sania Mirza went down to Bulgaria's Tsvetana Pironkova in straight sets in the first round of the Australian Open in Melbourne on Monday.
Coming back from a knee injury, Sania Mirza faces a stern test to improve her Grand Slam record when she opens her Australian Open campaign against Bulgaria's Tsvetana Pironkova on Monday.
Sania Mirza on Friday drew a tough first round opponent in Bulgaria's Tsvetana Pironkova in the women's singles event of the Australian Open, season's first Grand Slam tournament.
World number one Caroline Wozniacki did little to silence her critics as she struggled to win her singles match in Denmark's 2-1 loss to Bulgaria at the mixed teams Hopman Cup in Perth on Wednesday.
Top-seeded Flavia Pennetta defeated Tsvetana Pironkova of Bulgaria 6-2, 6-2 on Friday to reach her second semifinal of the season at the SNAI Open.
Venus Williams said she would not let anything get in her way as she tries to dish up a stone-cold dose of revenge on Tsvetana Pironkova, who dumped her out of Wimbledon last year.
Second-seeded Vera Zvonareva was upset by Tsvetana Pironkova 6-2, 6-3 in the third round at Wimbledon on Friday.
Tsvetana Pironkova of Bulgaria beat Mariana Diaz-Olivia of Argentina 7-6 (3), 3-6, 6-3 Monday in the first round of the Istanbul Cup.