I think that baseball players might be the scariest of all professional athletes in this regard. We play double the amount of games of both basketball and hockey, and football doesn't even come close. At least for those of us in the minor leagues, our season is simply 140 games in roughly 150 days. Once you figure out a game day routine that works, you ride it out like it is the law. There are players who eat the same meals everyday during the season.
Pitchers get into a routine each day.
And, everyone knows not to mess with another player when he is doing something that is part of the daily routine. This could be dressing the same way everyday or sometimes it starts with breakfast. Of course this gets to be rather anal. Personally, I try to keep the same routine as far as my daily routine. But, it really only starts when I get to the field.