Maybe his arm isn't 100% recovered yet - or maybe he can't yet trust in it 100% mentally.
Bellucci played well. Some of the denizens of MW have this mentality that Andy is the only factor in a tennis match. Bellucci has won claycourt titles on the ATP Tour (something Murray hasn't done) He got it spot on tactically by shortening the points when he could, and he deserves the spot in the QFs.
Thanks Andrew - one of the most sensible comments I've read on MW. I took the trouble to look up Bellucci's credentials before the match and on the strength of that predicted that he would win, unless, of course, Murray produced something exceptional out of a hat - something which, given his recent lay-off and residual arm problem, I felt was probably unlikely.
Last year Murray only went one round further in Madrid. And it seems that those with very short memories have forgotten how he well he played in MC, particularly pushing Nadal, the 'King of Clay', to the very limit before the effect of pain-killing injections started to wear off.
Yes, Murray does have psychological issues - but he appeared to be getting on top of them in MC. Unfortunately his injury set-back could see a return to square one, and I think he knows it. From the BBC report
Murray now heads to next week's Rome Masters and said: "I'm happy that physically I progressed." ..... "I've got to look more at the week as a whole, I was coming back from an injury that wasn't serious but an elbow injury isn't easy for tennis players.
"I was hitting the ball decent, I think I can definitely get better. You just need to be quite cautious and not do too much too soon because then you take a step back.
"I need to get my tennis back because that's the most important thing going into Rome and the French Open."
What a pity that the 'help' from the Adidas team has so far turned out to be so little because players such as Simon and Bellucci are also under their wing, which does beg the question of how much longer Murray can go on without a full-time coach.