WookieD
Didier Zokora
I agree he had a poor game, but you can't pin that one on him. Evra was marked by Lennon who just let him go without giving Walker a shout. You can see from Walker's reaction to Lennon that there wasn't one.
In the same token, Walker didn't once look over his shoulder during the entire passage of play and had a gapping hole behind him the entire time and he was practically standing on Caulkers or Gallas' heels as I remember. A better defender wouldn't have left such a space in the first place imo (if memory is serving me right).