While Little Sis was busy beating China's Li Na in straight sets, Big Sis handed a straight set Christmas gift 2-6,3-6 loss to Bulgaria's Tsvetana Pironkova.
"I just didn't get enough balls in today," she admitted. "I had a lot of opportunities and a lot of short balls but I just seemed to hit each one out. Obviously she played well but I don't think I did anything right today."
Yeah, 29 unforced errors will pave the way for a loss big time. It also means for the first time in three years there will be no all-Williams Ladies' singles final.
Meanwhile Little Sis was cruising to the semifinals with a 7-5, 6-3 straight set victory and a semifinal meeting with the Czech Republic's Petra Kvitova.
She'll face the winner of the Vera Zvonareva-Tsvetana Pironkova match. Zvonareva ousted Kim Clijsters in three sets to punch her ticket to the Ladies' singles semis.
Venus isn't done at Wimbledon yet. She can still collect a check and trophy in the doubles competition. She and Serena are still cruising through the Wimbledon Ladies' doubles competition and face the Russian duo of Elena Vesina and Vera Zvonareva in the quarterfinals.