BYU’s quarterback derby narrowed to two: senior Tanner Mangum and freshman Zach Wilson

Both played well in Saturday’s scrimmage, separated themselves from sophomore Joe Critchlow, freshman Jaren Hall

(Francisco Kjolseth | The Salt Lake Tribune) BYU quarterback Tanner Mangum runs through drills as the team opens preseason training camp on their practice field on Thursday, Aug. 2, 2018.