The junior guard hurt his knee during practice on Saturday. A medical test on Sunday found the tear, which will need reconstructive surgery and sideline him for the season.
Redford was one of the Atlantic 10's most accurate 3-point shooters in his first two seasons. He set a Xavier record by making 46.5 percent from behind the arc as a freshman. Of his 108 career baskets, 101 have come from behind the arc.
His long-range shooting forced defenses to extend and opened up the middle of the floor.