If you're only 10 games into the season and your players are already at 97%, then its going to get worse pretty quick. Hold your cursor over their fatigue percentage; a note on what their pace is will pop up. Players are granted a 10%-over-pace cushion before they fatigue. Anything over that will be directly deducted from them by game 15. So, if you have a player that is 25% over pace, then by game 15 he'll be at 85% fatigue.