I'd be a little worried if I were Lleyton Hewitt.
I don't think the confidence is back to what it was, and when you're confident you're faster, which is his greatest asset.
He's vulnerable. I don't think he's played as well as at previous Wimbledons.
Having said that, he's not going to go out without a big-time fight.
He still covers a lot of ground and I wouldn't write him off, but a guy like Taylor Dent, who he plays next, will see this as an incredible opportunity.
Safin lacking focus
I warmed up with Marat Safin and he was complaining about the knee.
But he played so well in the first two rounds it was disappointing to see the lack of intensity. He didn't crank it up in practice and he came out flat.
It would have been nice to see him more prepared because he knew he had a tough match - Feliciano Lopez had beaten him two out of three times.
Marat has never come back from two sets to love down and once he lost those first two you felt like it was over.
Lopez's best surface is grass. He's Spanish but he's un-Spanish in the way he plays.
He likes to serve and volley on most of his first serves and he's crafty. He's got an excellent game.
Murray in with a shout
David Nalbandian's serve is a weakness and it's definitely breakable. That's where Andy Murray has an edge.
And Nalbandian is carrying a bit of extra weight - I don't think he's as fit as he's been.
He's a very tough match player and he's without doubt the favourite and should win. But he's not training as hard as he should be.
John McEnroe was talking to John Inverdale on BBC1.