Andy Murray’s latest injury has sparked a concern that he could have already played his final match of professional tennis. Miami Open tournament director and former world No 4 James Blake hopes the Brit can return to action and bow out on his own terms. Murray ruptured ankle ligaments towards the end of his Miami Open exit against Tomas Machac last Sunday. He was able to play on through the final few games of the match but was in a lot of discomfort and scans afterwards revealed the extent of the damage. Murray says he will be out for an ‘extended period’ and has already pulled out of the fir…