WIMBLEDON, England — Former champion Maria Sharapova was knocked out of Wimbledon in a stunning upset today by a 154th-ranked Russian, marking her earliest exit from a Grand Slam tournament since her first full season on tour in 2003.

Her game littered by double faults and ugly unforced errors, the third-seeded Sharapova slumped to a 6-2, 6-4 loss to 20-year-old Alla Kudryavtseva on Court 1.

Sharapova, the 2004 Wimbledon champion at age 17, hadn't lost so early in a Grand Slam since going out in the first round at the Australian and French opens and the second round at the U.S. Open in 2003.

Sharapova is the second marquee player eliminated in as many days. But her defeat to a little-known player with a career Grand Slam record of 4-5 was a much bigger shock than No. 3-ranked Novak Djokovic's loss to former No. 1 Marat Safin on Wednesday.