[2] As a sophomore in 2011–12, the Cardinal won the NIT championship, and Powell earned Pac-12 All-Academic Honorable Mention selection.

[2] As a senior in 2013–14, Powell earned first-team All-Pac-12 honours for the second straight year and was named to the NCAA All-South Regional Team.

[4] On July 12, Powell's rights were traded, along with Brendan Haywood, to the Cleveland Cavaliers in exchange for Scotty Hopson and cash considerations.

[13] On March 28, 2016, Powell made his first NBA start and scored a career-high 16 points in a 97–88 win over the Denver Nuggets.

[17] On January 3, 2018, Powell tied his career high with 21 points in a 125–122 loss to the Golden State Warriors.

[18] On February 28, 2018, he again tied his career high with 21 points in a 111–110 overtime loss to the Oklahoma City Thunder.

[22] On December 4, 2019, Powell set a season-high 24 points while recording five rebounds, four assists, one steal and two blocks in a 121–114 win against the Minnesota Timberwolves.

Once the fourth quarter started, Powell experienced a left arm injury and got ruled out of the game.

[23] On January 21, 2020, in a game against the Los Angeles Clippers, Powell suffered a season-ending Achilles tendon injury while attempting to drive to the basket.