The women's bracket at Wimbledon is crumbling faster than you can grunt. Serena and Venus Williams were both defeated Monday, the first time the sisters have lost on the same day at the tournament. Only a few weeks back in action since her yearlong health-related sabbatical, seventh-seeded Serena lost to a swift corner ace by ninth-seed Marion Bartoli. No. 23 seed Venus, who has also been on leave due to injuries, was defeat by No. 32 seed Tsvetana Pironkova of Bulgaria. Top seed Caroline Wozniacki also suffered a surprising loss following an aggressive match with Dominka Cibulkova.