Washington attended Prime Prep Academy in Dallas after a brief stint at Lone Star High School in Frisco, before transferring to Findlay Prep in Henderson, Nevada, where he joined fellow five-star recruits Allonzo Trier and Derryck Thornton.

[9] Sources: Throughout most of his freshman season at Kentucky, Washington played through a pinkie injury that required surgery in the summer.

[11] Following Kentucky's loss to Auburn in the 2019 NCAA men's basketball tournament, Washington announced his intention to forgo his final two seasons of collegiate eligibility and declare for the 2019 NBA draft, where he was projected to be a first-round selection.

[13] On July 3, 2019, Washington officially signed with the Hornets[14] and on October 23 he made his debut in NBA, started in a 126–125 win over the Chicago Bulls with 27 points, 4 rebounds, an assist, a steal and a block.

[18] On February 28, 2021, Washington scored a then career-high 42 points to help the Charlotte Hornets win over the Sacramento Kings.

[24] On February 10, Washington made his Mavericks debut, putting up 14 points, five rebounds, and one steal in a 146–111 win over the Oklahoma City Thunder.

[26] On April 26, in Game 3 of the first round of the playoffs against the Los Angeles Clippers during a 101–90 win, Washington was ejected after being involved in a confrontation with Russell Westbrook.

[27] On May 11, in Game 3 of the Western Conference Semifinals, Washington led the Mavericks with 27 points during a 105–101 win over the Oklahoma City Thunder.

Jalen Williams subsequently missed a half court shot, and the Mavericks beat the Thunder in a 117–116 victory to advance to the Western Conference Finals.