There was no sign of that injury in the opening game as the huge, flatforehand that did for Federer in New York earned Del Potro an early break point, but Murray saved it with an ace and then took control.
Davydenko was now in command, making 70% of first serves and flinging himself out wide to anticipate Del Potro's flat serves and favourite off-forehand into the corner, and he wrapped up the first set after 38 minutes.