The San Francisco 49ers host the Arizona Cardinals this Sunday, and that means their first look at rookie quarterback Josh Rosen. The Cardinals looked set to let Rosen sit behind Sam Bradford learning the ropes, but Bradford was so awful, he earned his first start last week against the Seattle Seahawks.
The Cardinals lost, but Rosen performed pretty well. He only completed 55 percent of his passes, but his completion percentage took a hit due to drops. PFF graded his passing near 90 (out of 100), and his adjusted completion percentage was 72 percent.