U'u attended Rio Americano High School in Sacramento, California, where he was a three-time first-team All-Capital League honoree.
As a senior in 2007–08, he averaged 17.9 points and 5.0 rebounds per game, as he earned Sacramento Bee third-team All-Metro honors after helping the Raiders finish with a 22–6 record.
[3] In August 2013, U'u arrived in Australia to trial with the Perth Wildcats of the National Basketball League.
[6][7] He helped the Wildcats reach the 2014 NBL Grand Final series, where they defeated the Adelaide 36ers 2–1 to win the championship.
[14] In August 2018, he was appointed the assistant general manager of Sacramento's NBA G League affiliate, the Stockton Kings.
[15][16] In September 2020, he was furloughed by the Kings organization following the delayed start to the 2020–21 NBA G League season due to the COVID-19 pandemic.