Mary Pierce upset an aching Venus Williams 2-6, 6-2, 6-0 in the semifinals of the Kremlin Cup Saturday and will play Monica Seles for the title on Sunday.
Seles overcame Sandrine Testud of France in a hard-fought match 6-3, 7-6 (9-7).
Knee problems proved Williams' undoing. It appeared she began to have trouble in the second set and Pierce took the last five games.
She ended the set with three aces, and charged ahead again in the third, after Williams double-faulted twice to go down 0-2.
Williams called for a trainer immediately after the game, complaining about her knee. She appeared weak for the rest of the set, and Pierce went on to win 6-0 without giving Williams a point in the last three games.
Williams said her knee had been a problem throughout the match. "I wasn't doing the movement I normally do,"
she said. "I've been playing so many weeks now ... I think it just wore on my knee."
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