up here. i'm going to quote craig boynton. the coach said he's in trouble but the only thing getting him through was sheer will power. these athletes train to do what's basically mind over matter. i mean, he has never had to deal with this before. but he's had to deal with other adversity. i'm sure he had to play with an injury, for example, and play in pain at some point in his career. they are taught mental toughness. they are taught not to think about the big picture but think just about the point that's rye in front of them and that's how they get through something like this. carol, jim. >> zrech. >> stretch sing good. isner said something like that. while he was on the court he really didn't think about how tired he was. it was when he got off the court he was feeling the pain. >> right. that's a great thing. that's because he is such a great athlete, he was in the zone. they call it that. he was in the zone. he was just thinking about the next point in front of him and