Roy Helu was the Washington Redskins’ leading rusher as a rookie in 2011 and played a significant role for the team last season. As a result, his base salary for 2014 will double. According to two people familiar with the details of Helu’s contract, the Washington Redskins running back reached the “proven performanceescalator,” a clause in the collective bargaining agreement that rewards players who were drafted in the third through seventh rounds who are entering the final year of their rookie contract. That means Helu, who was supposed to earn a base salary of $645,000 this season, will instead earn a base salary of $1,389,000. The escalator does not affect any of the bonuses tied to Helu’s the four-year, $2.51 million contract he signed in July 2011. Helu qualified for the clause by playing in more than 35 percent of the Redskins’ offensive plays during two of his first three seasons. As a rookie, Helu played approximately 50 percent of the Redskins’ offensive snaps, running for 640 yards and two touchdowns and catching 49 passes for 379 yards and a touchdown.