It was a good performance by Murray, but Chela really was a shadow of his former self. 18 months ago he was good enough to reach the QF's of the US Open, and now, I'd be surprised if he could make it back to the top 100 if he plays like that on a regular basis.
Murray though did the job and looked to be playing well, although there wasn't too much of a reference given how poor Chela was.
Bodes well though for Murray to ease through the next couple of rounds and it's looking likely that he'll be able to reach the QF's without too much difficulty