i hope it aint serious...better not be

any one know what it was?

He twinged something (probably a muscle!) in the top of his right leg during a game near the end of the second set and immediately called for the trainer which is never a good sign. After treatment he didn't have full movement and his serve wasn't as powerful because, being left-handed, he leads off that right leg. He wasn't able to run after many of the balls but at the end of the second set it looked as though he was going to try and carry on. The bbc coverage stopped then so I'm afraid I don't know anything else!