The Stanford Cardinal announced Tuesday that Keller Chryst will replace Ryan Burns as the team's starting quarterback Saturday at Arizona, according to Jon Wilner of the Mercury News. 

The Cardinal (4-3) have struggled this year, losing three of their last four games. Burns, a senior, has played a role in those struggles, as he's completed 62.5 percent of his passes, throwing for 1,058 yards, five touchdowns and seven interceptions.

And in the last four games, Stanford has posted just three offensive touchdowns. That was magnified this past Sat...

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