Top-seeded Maria Sharapova was upset in straight sets Monday at the 2012 Wimbledon Championships by 15th-seeded Sabine Lisicki, 6-4, 6-3.
Because of the loss, Sharapova is assured to lose her No. 1 world ranking.
Lisicki is no stranger to Wimbledon upsets, as Monday was the third time in her career she knocked off the French Open champion at Wimbledon. She also defeated Li Na in last year's second round and Svetlana Kuznetsova in the 2009 quarterfinals.
With a big serve, Lisicki's game is tailor-made to succeed at Wimbledon. She had six aces and 18 winners Monday against Sharapova.
In other action Monday, Serena Williams beat wild card Yaroslava Shvedova of Kazakhstan in three sets and Roger Federer advanced past Xavier Malisse of Belgium in four.
For a complete tournament scoreboard, check SI.com.