But few expected her to give Williams trouble.
"She really didn't play her best tennis," Karatantcheva said. "I definitely don't think it was the Venus Williams I watch on TV and I see when I started out. But for me, I did give what I could give. I like that I won, no matter what."
Lindsay Davenport's fourth-round opponent will be two-time French Open runner-up Kim Clijsters, who eliminated No. 20-seeded Daniela Hantuchova 6-4, 6-2.
Clijsters has beaten Davenport in their past six meetings.
"Not the record you want going into a match with someone," Davenport said. "I have a tough time playing her on my favorite surface, let alone my least favorite, clay."
They'll meet on clay for the first time. A victory would put Davenport in the quarterfinals for the first time since 1999 at Roland Garros, the lone Grand Slam title she has yet to win.
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