Yeah, the interview afterwards really was cringeworthy. The interviewer did apologise to Andy afterwards though, he was probably told to try and get some reference to Sir Alex in there. I would have gone with some kind of Fergie-time comment myself though.
And bloody well done to Andy Murray. When he went 2 sets down I thought he was out, but we all know he's a fighter and if one thing has really improved over the last few years, it's his mentality. He didn't beat himself up too much, he remained calm, he changed his game slightly, and he found a way to win. Considering players like Federer and Nadal haven't been able to do the same thing themselves this tournament when faced with inspired opponents, Murray deserves a lot of credit.
As for whether he's playing well enough to beat Novak, I think this match will do him some good, having been really pushed. As good as Novak has been, no-one has pushed him (though I expect Del-Potro will), and sometimes I think you need that push to really get you ready for the biggest matches.
The semi should be a more straighforward match though. Janowitz hits huge serves but doesn't have the variety of spin and power than Ferdasco does (from what I've seen anyway). Considering that Murray is generally one of, if not the best returner of serve around, he can hopefully negate Jerzy's biggest weapon and move him around the court and win fairly comfortably.