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Then he missed the first preseason game and a week of practice because of a strained groin he suffered Aug. 6. Grossman played well in the preseason opener while Beck watched.

Lastly, Beck struggled in Thursday’s preseason finale, admitting he was not sharp. In two quarters against Tampa Bay’s defensive reserves, he was 10-of-21 for 108 yards and an interception. It was not sufficient production from a starting quarterback playing against nonstarters.

Grossman believes he is capable of playing better than his eight-year body of work in the NFL suggests. Last week, he said he is making faster decisions because he is familiar with the offense after starting the final three games of last season.

He cited his touchdown pass to Santana Moss in the third preseason game. By contrast, that same play resulted in a fumble against the Giants in last year’s regular-season finale when he hitched twice before deciding where to throw.

Beck’s upside could be greater than Grossman’s because Beck has started only five games, but Shanahan believes Grossman will play above his reputation as an inconsistent passer who is prone to turnovers.

“You try to evaluate people from how they perform with me, not how they’ve done in the past or the rumors that I hear,” Shanahan said. “He’s done a good job since he’s been here.”