"I'm grateful for this opportunity BYU has given me and can't wait to play there next year," Bergersen wrote. "I look forward to being a Cougar next year."
Bergersen was the 5A Southern Idaho Conference Player of the Year at Borah before playing for Link Year Prep of Branson, Mo. He averaged 18 points, five rebounds and three assists per game and shot 42 percent from the 3-point line at Link Year.
He also took an official visit to Hawaii, according to the Idaho Statesman newspaper. LSU also showed some interest.
"They've been pretty consistent about talking to me throughout this whole process," Bergersen told the Statesman, referring to BYU's coaching staff. "They have really been on me a lot, and I've talked to them a lot. I loved going to visit. I fit in well with the coaches and players and the way they played. It just felt like the right place for me."
Bergersen is the son of Roberto Bergersen, a former Boise State standout who was a second-round draft pick of the Atlanta Hawks in 1999. Roberto played professionally overseas in Turkey, Spain, Italy and France.
Rylan Bergersen averaged 15.5 points, 5.7 rebounds and three assists for Borah in 2015-16.
BYU's roster currently includes Boise-area forward Braiden Shaw (Eagle, Idaho). Kolby Lee, a 6-9 forward from Boise's Rocky Mountain High, signed with BYU last November but will go on an LDS Church mission before enrolling.
Last week, BYU assistant coach Terry Nashif announced he was leaving the program to pursue business interests, and two weeks ago BYU announced that guard Zac Seljaas would rejoin the program after his church mission was cut short by an ailing shoulder.