French Open - Mats Wilander casts his expert eye over Thursday's play at Roland Garros, and explains how Gaston Gaudio threw away a two-set lead against Lleyton Hewitt.

Gaston Gaudio is a very 'mental' player. When he really feels like playing he is a great player. He is probably among the five or six best clay court players in the world but mentally he's a little weak.

At two sets to love up you'd think he would s3icth into a higher gear, but he actually went backwards and let Lleyton Hewitt back into the match. Hewitt did a great job hanging with Gaudio because he knew this could happen. But it's very disappointing if you're Gaston Gaudio.

What Gaudio does so well with his backhand is he stays down so well, and stays down through the shot. He disguises it so he puts his feet in just about the same position as he does when he hits the crosscourt backhand.

He has all the tools to be a great player, and used this beautiful backhand really well in the first two sets, but then forgot to use it after that.

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I think Amelie Mauresmo's win against Nathalie Dechy was expected. She's clearly the better player but as we know Mauresmo has had her problems here at the French Open. And playing a Frenchwoman is not easy.

It's not difficult to play against a friend, but it's difficult to play someone you have played a lot of tennis against in practice because you get stuck doing the same thing and it's hard to play a good match tactically. But they are professionals and you don't see them say "Come on!" or "Allez!" too much, so they are both very civilised.

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I think Rafael Nadal knows he is playing well enough and he recently said he is playing his best clay-court season ever even though he lost his winning streak. He plays exactly the same way in every match. If you're good enough you can play with him. Otherwise you realise after 20 minutes - 'I'm not good enough'.