Arizona starting guard Brandon Williams will miss the 2019-20 season after undergoing knee surgery, the school announced Wednesday.
Williams averaged 11.4 points and 3.4 assists as a true freshman.
The combo guard missed six games late last season because of a problem with his right knee, the same knee in which he had surgery in January 2017 because of a congenital issue that affects blood flow.
"Brandon is one of the most talented guards we have recruited during my tenure as head coach at Arizona," coach Sean Miller said in a statement. "A year ago, Brandon quickly became one of our team's best players and one of the Pac-12's most exciting freshmen. The news of Brandon's season-ending surgery is beyond disheartening."
Williams was one of two returning starters -- the other being center Chase Jeter -- from an Arizona team that went 17-15 and missed the NCAA Tournament.
The Wildcats bolstered their backcourt with the addition of five-star freshman point guard Nico Mannion and the addition of grad transfer Max Hazzard, who averaged 12.5 points per game last season for UC Irvine as the Anteaters won a game in the NCAA Tournament.
Sophomore guard Devonaire Doutrive also decided to return after announcing his transfer and taking recruiting visits this summer.
"I've overcome obstacles before in my life and will work with our strength and medical staffs to overcome this one," Williams said in a statement. "I'm dedicated to continuing my work in the classroom as a student, and I look forward to supporting my teammates and coaches as I spend this season focusing on my health."