BIRMINGHAM, England(AP) Maria Sharapova believes she can win Wimbledon again.

The 23-year-old Russian says: ``I go in believing that I have a chance.''

Wimbledon starts June 21. Sharapova won the tournament in 2004.

Sharapova is warming up at the grass-court Aegon Classic tournament in Birmingham, England, which starts Monday.

The Russian, ranked 13th, says she loves the switch from clay to grass.