Andy Murray warned towards retirement as stark Serena Williams level made

“I don’t think anyone would have thought that when he sort of unofficially retired at the Australian Open a couple of years ago that Andy would still be playing and playing as well as he is,” added Robson.

“So it’s such a testament to the hard work that him and his team have put in over the last few years to be healthy enough to withstand best-of-five set tennis again, but also just to play 10 matches in a row like he did over the last few weeks.

“Two years ago, even 18 months ago, I don’t think anyone would have thought that would be physically possible for him with the amount of recovery that he needs to do pre and post-match. So that, for me, is the main thing. If he’s able to stay healthy, then who knows, he might outlast some of the younger ones at this rate.”