Martina Navratilova says she's confounded trying to handicap the Wimbledon fields, reports the web site Forty Deuce.

"I have no idea," It's wide open," she said. "On the men's side you have to look the top four. I don't see anybody, maybe [Robin] Soderling, though he hasn't played that well this year, so the top four are the heavy favorites. Murray more so now because he did so well on the clay, Djokovic is playing the best he's played in his career, Federer played the best French he's played, but a lot of that is because of the balls. Basically, with these balls on grass I'd pick Federer for sure. The balls they play with now, from what I understood, are pretty heavy, the players were struggling, which will help [Rafael] Nadal tremendously, I think Djokovic will be OK, I think it'll hurt Roger."

Navratilova offered a shout out to French Open champion Li Na as having a shot to claim back-to-back majors at Roland Garros and Wimbledon, something that has not been done on the WTA Tour since Serena Williams accomplished it in 2002.

"If Li Na can cope with all of the attention that I'm sure she's getting now she's got a good shot at it," Navratilova said. "And she does well on grass.  She won [Birmingham]  last year and her game transfers well on every surface.  Maria Sharapova now, I think she's the  favorite.  She'll be ready.  She loves the grass and she'll be pretty confident after the French.  The Williams sisters, it's such an unknown.  They could be in the final or they could go out in the second round because they haven't played.  If Serena wins, is it because she's that good or is it because the rest of the field of women's tennis is not so good? I think it would be a little bit of both.  We'll see how she's hitting the ball when she comes out.  But it's like betting on a horse that you haven't seen run yet.  She's a Triple Crown winner.  She'd be a favorite no matter what.  Am I going to get in trouble that I compared Serena to a horse?  She's a thoroughbred, that's for sure."