Who will take the top spot from Venus once she gets it? Is thinking this far ahead a way of making her ascension easier to swallow?
Anyway, why couldn't it be Jennifer? Sure, Jennifer has a lot of points to defend up through the French but then her tennis fell off. No reason she can't play at least as well this year. She sure showed mental and physical toughness at the Asutralia n Open. And why couldn't it be Lindsay? She has a fair amount of points to defend in the early spring but then nothing because she was out injured for four months last year- and Lindsay has a history of coming back strong from injuries and kicking butt. Why not the Belgian girls (especially Kim?) They work hard and keep improving. I think Kim is ready for a big move. Hingis? She may have no titles to defend but she has a TON of semis to defend- and frankly, when the competition is tough, semi level tennis is all she seems capable of
My answer would be, almost any of the top players BUT Hingis will be Venus's toughest challenger.