[3][4] He shared Player of the Year honors with Boise State's Chandler Hutchison, who received the MW media version of the award.

He and his brother then led the team to the 2018 NCAA tournament, where they advanced to the Sweet 16 after coming back from double-digits in wins over Texas and Cincinnati.

[9] On October 25, Martin made his NBA debut, coming off the bench in a 99–121 loss to the Minnesota Timberwolves with four points, two rebounds, three assists, two blocks and a steal.

[11] On March 9, 2020, Martin scored a season-high 23 points, alongside four assists, three steals and two blocks, in a 138–143 double overtime loss to the Atlanta Hawks.

[12] On April 13, 2021, Martin scored a season-high 17 points, alongside ten rebounds and five assists, in a 93–101 loss to the Los Angeles Lakers.

[15] On September 14, 2021, Martin signed with the Miami Heat on a two-way contract, splitting time with the Sioux Falls Skyforce.

[17] On December 8, Martin scored a career-high 28 points, alongside eight rebounds, three assists and two steals, in a 113–104 win over the Bucks.

[24] During the first round of the 2023 NBA playoffs, Martin played a key role in the eight-seed Heat upsetting the top-seeded Milwaukee Bucks,[25] averaging 11.2 points, 5.4 rebounds, and 2 assists per game.

[26] In Game 7 of the series, Martin scored 26 points, and grabbed 10 rebounds in a 103–84 win, helping the Heat advance to their second NBA Finals appearance in four years.

[27] Martin came one vote short of besting teammate Jimmy Butler for Eastern Conference Finals MVP while averaging 19.3 points and 6.4 rebounds per game, whilst shooting 60.2% from the field and 48.9% from three.