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Oklahoma roster rankings, Nos. 10-6: Brendan Radley-Hiles and Caleb Kelly hold the key to defensive success

Editor's note: This article originally published on May 10.

With spring ball in the rear-view mirror and summer workouts fast approaching, Oklahoma's football offseason is heating up.

Perennial stars like Baker Mayfield, Dimitri Flowers and Mark Andrews are long gone, as are defensive mainstays like Steven Parker and Will Johnson. So it begs the question: Who will be the next generation of players to replace those program pillars?

This week, we'll take a look at the best 25 players on Oklahoma's roster with spring ball in the books. Here's the fourth installment, which covers Nos.