Actually Wiserer played 69 matches this year, while Tomic played 51.
Use your head, that has nothing to do with how many tournaments you necessarily play.
The real number that is hurting Tomic is this-
Federer - 17 tournaments played
Tomic - 25 tournaments played
Either way, you can't really blame Tomic, he has yet to be anywhere near his physical peak (probably mostly because he has yet to find the right discipline to focus on his physical game) and he doesn't have the experience yet to manage a good schedule. I mean when you're that young, you feel like you have enough energy to go around playing every tournament, and especially since he needs all the points/money he can get at this moment, he'll be trying to chase after tournaments for a while anyways.