The announcers (on DirecTV's extra Wimbledon channels) didn't seem to know what was going on, so you didn't miss much. I didn't see the entire match but they were saying that Robby had been acting as though his back was bothering him. Before he called the trainer, he'd sometimes bend forward and looked like he was trying to stretch his back out a bit between points... let his body weight fall forward, his arms hanging loosely. He certainly was wincing when the trainer was manipulating his neck & shoulder/upper back.
Yes the wincing I clearly saw. As I said always nagging injuries no matter exactly where they are located
I think Robby should try Yoga or something like that where the concentration is on stretching the muscles rather than building up muscles. Robby seems plenty strong, but I don't think he is very limber. His body needs to be more flexible I think to try to avoid some of those injuries IMO.