Yes, and with top athletes, the margins that it takes to be not quite right must be quite small. We'll see. Pity, though, whatever the cause - he must have hoped for so much more from this first five months!

Would second JonH. Saw Jack Sock play doubles at Wimbledon a few years ago, and think (from the bits I've seen online) he's improved since then. The need to stay away from his forehand puts opponents under pressure; his backhand has improved; and he has terrific hands at the net. He's one of the players whom I'd now regard as meaning that a partnership is a threat, whoever the second partner may be.