SEA ISLAND - A thigh injury forced Anna Kournikova to withdraw from the Cloister Cup before her semifinal match.<br>
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Kournikova quit the tournament Sunday after a practice earlier in the day.<br>
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The withdrawal advanced fellow Russian Maria Sharapova to the final, where she beat Australian Christina Wheeler 6-4, 6-3 Sunday.<br>
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Kournikova was first injured April 9 at the Family Circle Cup in Charleston, South Carolina.<br>
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She struggled through her quarterfinal match against Sunitha Rao on Friday, which she won 6-3, 6-3. Kournikova's tightly wrapped thigh gave her problems throughout the match, and she was limping by the end.<br>
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The Cloister Cup was Kournikova's first event since she was first injured.
