View Photo Gallery: Redskins beat Colts 30-17 in matchup of top rookie quarterbacks Robert Griffin III and Andrew Luck

Rex Grossman was sharp after taking over at quarterback Saturday for the Washington Redskins in their 30-17 preseason triumph over the Indianapolis Colts.

Grossman completed all eight of his passes for 127 yards and two touchdowns. He relieved starter Robert Griffin III in the third quarter, and gave way to rookie Kirk Cousins late in the fourth quarter. Grossman had a perfect passer rating of 158.3 on the day.

“It felt good,” Grossman said. “We executed well. And when this offense executes well and you’ve got people running the right plays and getting good depth, it looks real crisp.”

Grossman hadn’t played at all in the Redskins’ second preseason game a week earlier in Chicago. Cousins played the entire second half in that game and threw for 264 yards and three touchdowns, prompting some suggestions that the Redskins could have a starting-quarterback controversy brewing. But Cousins was quick to dismiss that, saying last Monday that the starting job clearly belongs to Griffin.

It still seems likely that Grossman, not Cousins, will enter the regular season as the Redskins’ primary backup to Griffin. Grossman gives the team some experience at the position and it seems unlikely that the Redskins would go into the season with a rookie backing up a rookie. That would leave Cousins as the third-stringer, although Coach Mike Shanahan has declined to discuss the situation in detail.

Grossman completed only two of 10 passes in the preseason opener at Buffalo. Shanahan said he went with Cousins after Griffin in Chicago because he wanted to give Cousins a chance to play and didn’t want Grossman to play only one series against his former team, the Bears.

Grossman threw touchdown passes Saturday to wide receivers Josh Morgan and Dezmon Briscoe.

“He played great,” Briscoe said. “He was perfect—no sacks, eight for eight, two touchdowns.”