In four games as a starter with the Redskins, Rex Grossman has thrown for 300 yards three times. He’s also tossed nine touchdowns.

In 37 career games prior to signing with Washington, Grossman had thrown for 300 yards just one time.

“I really don’t worry about what somebody’s done in the past. Just what he’s done here,” Shanahan said about his quarterback’s stints in Chicago and Houston. “He’s been pretty consistent since he’s been here. The way he works in practice, the way he goes about his business. All I can do is judge Rex, or any other player, [on] what they’ve done since they’ve been with the Washington Redskins.”

With the Redskins Grossman has played in five games and posted a 2-2 record as a starter. He’s completed 57 percent of his passes while averaging a yard-and-a-half more per attempt than he has for his career.

In Sunday’s win over the Giants, Grossman completed 21 of his final 30 passes. He targeted seven different receivers and completed passes to six of them, throwing for more yards than 22 of the NFL’s 32 quarterbacks did on Sunday.

“I think he did everything very well,” Shanahan said about Grossman’s season-opening performance. “You’re going to have a few mistakes in the game, everybody does. You try to eliminate those mistakes and you’ve still got to win football games.”