Sania Mirza was leading 6-1, 2-0 when Alexandra Stevenson retired with a right shoulder strain.
Petra Kvitova's hopes of defending her Wimbledon title were shot to pieces in a hail of Centre Court cannon fire from Serena Williams who ousted the defending champion 6-3, 7-5 in their quarter-final on Tuesday.
Serena Williams moved another step closer to a record-tying 24th career Grand Slam title with a comfortable 6-3, 6-2 victory over Czech Karolina Muchova on Friday to reach the last 16 at the US Open.
Twice Wimbledon champion Serena Williams withdrew from this year's tournament because of injury.
The showdown will see world number one Serena Williams try to equal Steffi Graf's professional era record of 22 Grand Slam singles titles, while Angelique Kerber will seek to become the first German woman to lift the Wimbledon singles crown since her idol Graf 20 years ago.
Olympic champion and world number one Serena Williams tumbled out of the Rio de Janeiro singles competition in the third round on Tuesday after a shock defeat to Ukraine's Elina Svitolina.
Schnyder's reward will be a semi-final against third seed Jelena Jankovic, at the Italian Open.
A resurgent Serena Williams overcame a strong challenge from fellow-American Meghann Shaughnessy, winning 6-7, 6-1, 6-4.
World No 1 Serena Williams comfortably beat 15-year-old CiCi Bellis.
World number ones Serena Williams and Roger Federer showed little gratitude to their hosts as they knocked out the last remaining home players on Monday to reach the quarter-finals of the Australian Open.
Serena Williams made the most of a break in her match against 13th seed Svetlana Kuznetsova on Monday, when the Centre Court roof was closed after she threatened to sue organisers if she fell and injured herself on the slippery turf.
Roger Federer and Serena Williams booked a second round berth, while Robin Soderling was booted out, during the Australian Open on Tuesday.
The American hit back at claims that she exaggerated her calf injury during her dramatic fourth round victory over Daniela Hantuchova.
Serena Williams continued her smooth lead up to next week's Australian Open with a 6-2, 6-2 win over Vera Dushevina at the Sydney International on Wednesday.
Williams, who played an exhibition match last December in the United Arab Emirates, where she lost to French Open champion Jelena Ostapenko, said in addition to working on her serve and returns, she needs to manage her time better now that she has her daughter in tow.
Serena Williams marched into the second round of the US Open on Tuesday and despite being seeded only fourth at Flushing Meadows, the American is in no doubt she is the world's best player.
The World No 2 announced her commitment to the social media entrepreneur shortly before the New Year and while it was "great", she was pushing it to the back of her mind, at least until after Melbourne Park.
Images from Day Nine of the 2013 US Open in New York on Tuesday.
Serena Williams is on the brink of the grandest achievement in tennis, the single season Grand Slam, and even the leading men at the US Open championships starting on Monday are cheering her on.
Serena Williams battled her way into the Australian Open semi-finals with a 3-6, 6-2, 8-6 win over Israeli Shahar Peer.
Victoria Azarenka won a showdown between the world's two top players by beating number one Serena Williams in a three set 2-6, 6-2, 7-6 thriller in the final of the Western and Southern Open on Sunday.
Serena Williams pulled out of next week's Nasdaq Open in Miami on Friday, citing a knee injury and lack of training.
IMAGES from the Australian Open on Tuesday.
Serena Williams is under investigation by U.S. Open tournament officials for the ugly outburst she directed at the chair umpire during her loss to Australian Sam Stosur in the final on Sunday.
Serena Williams, who racked up her 500th match win with the victory, said her ankle is still causing her problems, a potential issue for tougher tests ahead.
Novak Djokovic scraped over his first hurdle at the Rome Masters.
Images from matches played on Day 4 at the US Open at the Flushing Meadows in New York on Thursday.
Serena Williams is prepared to go without another victory this year, as long as she mounts a successful title defence at next week's U.S. Open.
Venus has no plans of following her younger sister into retirement any time soon.
Pliskova was down 5-1 against Williams in the final set before the seventh seed produced a fight-back for the ages to claim a 6-4, 4-6, 7-5 quarter-final win over the American great.
=Nora Fatehi and Sneh Binny unveil the Delhi Binny's Brigade team jersey in Mumbai. The Delhi Binny's Brigade is one of the teams who will play the Tennis Premiere League.
Victoria Azarenka, the 19-year-old from Belarus, thrashed injury-hampered world number one Serena Williams 6-3m 6-1 to win the Sony Ericsson Open on Saturday. The victory, the first top-tier triumph for Azarenka, stopped the American claiming a record sixth title at Key Biscayne.
Sloane Stephens has denied she was celebrating the shock fourth round exit of World No 1 Serena Williams and said she felt the television footage was intrusive.
Indian imports of Russian oil plunged by a record in August month-on-month (M-o-M) as discounts on the fuel shrank in tandem with rising Brent oil prices. Higher crude prices will drive inflation or hurt earnings at oil companies and India's fiscal position if such spikes are not passed on to consumers. Indian purchases of Russian crude declined by around 24 per cent in August from July to the lowest level since January, with refiners expecting volumes to drop further amid rising rates of Russian benchmark Urals grade, substantial stocks at refiners, and planned maintenance at Indian refineries, according to ship tracking data and industry officials.
Serena Williams and Roger Federer both enjoyed Sunday afternoon strolls at Roland Garros as they seized the opportunity to gain head starts over their French Open rivals in ruthless fashion.
Serena Williams capped off a season to remember by capturing her fourth WTA Championship title with a 2-6, 6-3, 6-0 win over Li Na on Sunday.