You can't make that determination. No one can. That's why the matches have to be played. Comparing players from different generations is risky business at best.Uh, Jennifer Capriati held her own quite well against Serena in her prime. I'd be willing to bet that peak Navratilova, Graf, and Seles would have handled Serena as well. Venus born 10 years earlier would have a similar career to Gabriela Sabatini. She probably loses to Graf and Seles more often than not.