As tennis watchers eagerly anticipate the belated emergence of a new generation, John McEnroe believes next year could instead be defined by another renaissance story. Roger Federer, Rafael Nadal and Novak Djokovic have all enjoyed their tennis equivalents of a comeback tour in the last couple of years, but what about the fourth and final member of the erstwhile ‘big four’, the forgotten man Andy Murray? “I’m sure Andy looks at those three and says: ‘I should be able to do something akin to what they’ve done’. At least come back to sort of what he was before,” says seven-time grand-slam champion McEnroe, who is in London competing at the veterans Champions Tennis event. “If he does that, if you look at the top five, it’s not as if he can’t look at those players and think on a given day at Wimbledon that he couldn’t go the distance potentially.” McEnroe does, though, issue a caveat: Murray needs to have fully shaken off the hip troubles that have dogged him since the summer of 2017. “Almost all of it depends on his level of health,” he says. A quick recap on Murray’s hip saga: Having limped his way through last…