Like I've said numerous times when this comes up: what exactly is the asking price for Sam Querrey or John Isner to be on a video game? Most of these guys probably want to be in the game just as badly. There is no way they couldn't get top 20-70 players in this game for dirt cheap. If they ask something ridiculous, you just pass on them and get someone else.
At the very least, we should have 32 currently playing men in any tennis game to have at least some sort of tournament.
My only hope now is we have a huge amount of free spaces to create a player. You can create 100s of players in NBA2K12.