Stanford claimed a crucial commitment from top-ranked California quarterback KJ Costello on Thursday afternoon.

The Santa Margarita Catholic High School junior selected Stanford from a trio of finalists that also featured USC and Michigan:

Costello, a 4-star prospect, is rated fourth nationally among pro-style passers in 247Sports' composite rankings. He was listed No. 1 among uncommitted quarterbacks in the 2016 class.

The Cardinal land one of the most coveted offensive pla...

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