If he starts playing tennis in a wheelchair I will not be impressed. For the sake of his health he needs to call it a day. If he hurts putting on his socks, he is no condition to take on players who know they just need to run him around. Kind of cruel, especially when Murray was perhaps the most mobile of them all in his day. He said he was playing in pain for a number of years, makes you wonder how good he could have been if healthy. He was still always able to take a set or two against the best and sometimes win. Just maybe that pain was the difference in a long match.