It's human nature to perform better with incentive. If your performance determines your pay, that will provide a jolt to the way you go about your job. Whether it has an impact on football players is up for debate, but with contracts not being guaranteed, playing well in a contract year is essential to getting that large signing bonus. Many big name players will be free agents at the end of the season and with the Collective Bargaining Agreement expiring in March, a possible uncapped year looms in 2011. Here are some players in the final year of a contract.