Berlin Venus Williams twisted her ankle while avoiding an loss against Karolina Sprem on Saturday and said the injury could force her to miss the German Open final against Amelie Mauresmo.
Mauresmo surged into today's title match of this $1.3 million French Open tuneup with a 6-2, 6-0 rout of Jennifer Capriati in the other semifinal.
Williams was overpowered in the first set but recovered to win, 2-6, 6-3, 6-4. She wore tape on her left ankle after twisting it in the final game against the 19-year-old Croat.
"I don't know what's going to happen. I'm going to deal with it tonight," Williams said. "But I'm extremely motivated to play. So that's a good sign."
She trailed 3-0 in the final set before regrouping to extend her winning streak to 15 matches. If Williams plays today, she will be chasing her third straight title.
Sprem, ranked No. 29, made the crowd gasp at times in racing through the first set in 23 minutes, slamming winner after winner on the clay court against a player once ranked No. 1.
"She played unbelievably, and it took me awhile to find my game," said Williams, who is seeded third. "But I never thought I would lose, not even at 0-3."