[Updated at 11:56 a.m. ET] Less than two hours after her sister went down in straight sets at Wimbledon, Venus Williams suffered the same fate.
Bulgaria's Tsvetana Pironkova, the tournament's No. 32 seed, beat the No. 23-seed Williams 6-2, 6-3 in the fourth-round match.
[Posted at 10:34 a.m. ET] Serena Williams is out of the Wimbledon women's singles tournament after losing in straight sets to Marion Bartoli.
Williams, the No. 7 seed, was the defending champion, having won the 2010 competition. She lost her fourth-round sets Monday 6-3, 7-6.
Bartoli, 26, of France, is the No. 9 seed. She placed fourth in last year's tournament at the All-England Tennis Club.
Bartoli was a finalist in the 2007 competition, losing to Williams' sister, Venus.
Follow CNN's full coverage of Wimbledon on CNN International.