In September 2012 during his senior year in high school, Allen committed to play basketball for the San Diego State UniversityAztecs after high school.[4] During the high school recruiting process, he received offers to play basketball from every Pac-12 Conference college and many other big colleges in the Western United States.[5]
Through his first two seasons with the Aztecs (2013–14 and 2014–15), Allen was primarily on the bench. He started just one game out of the 62 total games he played, averaging 2.5 points and 11.3 minutes per contest.[6][7]
During his junior year (2015–16), Allen enjoyed an expanded role with more minutes, and greater success. As the team's sixth-leading scorer and starting 17 of 38 games, he was mainly in the team's sixth man role. He averaged 6.2 points, 2.7 rebounds, and 1.2 assists per game, while nearly doubling his minutes from the previous two seasons with 22.2 per game.[8]
For his senior year (2016–17), he became a full-fledged starter, being the team's only player to start all 33 games. He averaged 8.3 points per game to go along with 4.2 rebounds and 1.4 assists in 28.2 minutes.[9] At the end of the season in 2017, the league's head coaches named Allen the Mountain West Defensive Player of the Year due to his skillfully tenacious defense, as evidenced by his 39 steals, 29 blocks, and 85 defensive rebounds that season.[10] His defensive play has also been aided by his unusually long wingspan (7'1") in proportion to his height (6'5").[6]
Eleven days later on January 28, 2018, the Agua Caliente Clippers picked up Allen via the G League available player pool.[13] On February 11, 2018, in a game against the Northern Arizona Suns, Allen posted a career-high 22 points in a 113–109 loss.[14][15]
On January 8, 2019, the Grand Rapids Drive acquired Allen from the Agua Caliente Clippers in a trade.[16] During the 2019–20 season, Allen averaged 7.9 points, 3.2 rebounds and 2.6 assists per game.[17]
In a 2015 radio interview on the "Scott and BR Show" hosted by Scott Kaplan and Billy Ray Smith Jr.onXEPRS-AM "The Mighty 1090", Allen revealed that the meaning of his given name "Dakarai" is "happiness" in Swahili.[21]
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