Look for good performances outside specialties, but beware. All players have primary categories where they need to perform for large bonuses. However, some players also have secondary categories, where if a players does well, they get much more credit for. This is mostly a football thing, applying to receiving and rushing stats. The other side of this though, is that a player who has no estimates for that category doesn't get a bonus.
Goalies get no bonus for scoring or assisting on a goal.
Pitchers get no bonus for home runs. Special teams doesn't count for football. Don't let yourself get sucked in by the excitement of a defensive fumble recovery, or some such. Bad games happen to good players. If you bought a player before the game, and they don't perform, don't be afraid to sell that player.