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San Francisco coach Kyle Shanahan took only a cursory look at Josh Rosen in his draft preparation last spring because the 49ers already had franchise quarterback Jimmy Garoppolo in place.

Shanahan studied Rosen a lot more closely this week after the rookie made his first career start in the NFL. Now he has to face him when the Arizona Cardinals (0-4) visit the 49ers (1-3). Shanahan came away impressed, even though Rosen threw for only 180 yards and one touchdown in a 20-17 loss to Seattle.

“He’s a very good thrower. He made some very good throws in that game,” Shanahan said. “They definitely, I believe, should have won that game. They had two big ones that were dropped, I think two touchdowns. It was impressive. So, as similar to college, we know we’re going against a good player. He definitely helps them.”

Arizona needs plenty of help as the NFL’s only winless team. The Cardinals 0-4 for the first time since 1986 – two years before they moved from St. Louis to the desert.

The Cardinals’ 37 points are their fewest after four games since 1945 and the fewest in league since Jacksonville had 31 in 2013. Arizona has gained only 834 yards with Sam Bradford and Rosen at quarterback, tied for the fewest in the NFL after four games since the expansion Texans had 774 in 2002.

The lack of early success hasn’t shaken the confidence Rosen gained in college at UCLA when he played well enough to become the 10th pick over all in this year’s draft.

“I’m a very confident person,” he said. “Even if I have no reason to, I’ll find a way to fool myself into going out there with full confidence that we’re going to win every single game we play.

"Every time I step on the field, I expect to throw a touchdown or hand off a touchdown or lead the team to the end zone in some way. In my head, if I don’t, it’s a surprise and something’s wrong and we’ve got to fix it so that we do next time.”

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