You may well be right. I don't imagine those blisters we got a close up of while they were being dressed would have helped either!
Fuck knows how he played with the blisters - if that was me I'd have been laid up in bed for a week.
Watching them slog it out I was wondering whether there are any sports that are more physically demanding than tennis? They often play 4-5 hour matches in grand slams, not many individual sports where you have to be at your limit for so long.