I don't like that rule about voiding bets when a guy retires, especially when they are clearly going to lose the match anyway. I know they brought this rule in to stop rorting, but I think it could still lead to some funny stuff. A player who thinks he has a chance of upsetting one of the top players could get someone to whack a huge amount of money on him at big odds, then if he's trailing 2 sets to love and 5-1 or something, he could just fake an injury and his mate gets all his money back. It's like a free bet to nothing.