Mike Shanahan's brief fling with John Beck is over, as Rex Grossman will start for the Washington Redskins in Sunday's game against the Miami Dolphins, according to a team source. Beck took over for Grossman in October after a flurry of turnovers from Grossman in the Redskins' loss to the Philadelphia Eagles. The offense hasn't improved under Beck, however, and has scored one touchdown in the past two games -- and that score came in garbage time against a 49ers prevent type defense. Grossman began getting more first-team work in practice, according to the source. Shanahan informed the team of the quarterback change over the weekend. The Redskins, with personnel and injury issues on offense, lost all three of Beck's starts. Beck threw four interceptions to two touchdowns in his four games this season. Source: NFLNetwork