Houston Rockets (2020–2023) 2020-21 On November 18, 2020, Martin was selected by the
Sacramento Kings in the second round of the
2020 NBA draft with the 52nd overall pick. On November 25, he was traded to the
Houston Rockets in exchange for cash considerations and a future second-round pick. Martin signed a four-year contract with the Rockets on November 30. The Rockets organization put him on their G League affiliate team, the
Rio Grande Valley Vipers. Martin was activated by the Houston Rockets for the January 4, 2021, game against the
Dallas Mavericks, then was inactive for one game before making his on-court NBA debut on January 8, 2021, vs. the
Orlando Magic, scoring 7 points on 3-3 shooting (including a three-pointer) On May 8, 2021, Martin scored a season career-high 27 points against the Utah Jazz. He had a then-career high 10 rebounds in three different games, all in May 2021.
2022-23 Before the season, Martin made a trade request to the Rockets with the desire of playing more minutes. He instead became a full-time starter when Eric Gordon was traded in February 2023. Martin played in all 82 of the Rockets' games, starting 49 of them in his third season in the NBA. He also achieved career highs in points per game (12.7), field goal percentage (.572), rebounds per game (5.5), and minutes per game (28.0). On November 25, 2022, he scored 21 points along with a career-high 15 rebounds in a 128–122 win against the
Atlanta Hawks. On March 22, 2023, Martin scored a career-high 31 points, shooting 12-18 from the field against the
Memphis Grizzlies. On February 18, 2023, he was one of four participants in the AT&T Slam Dunk Contest on all-star weekend.
Los Angeles Clippers (2023) On July 8, 2023, the Rockets traded Martin to the
Los Angeles Clippers for two future second-round picks.
Philadelphia 76ers (2023–2025) On November 1, 2023, the
Philadelphia 76ers acquired Martin,
Marcus Morris Sr.,
Nicolas Batum and
Robert Covington from the Clippers in exchange for
James Harden,
P. J. Tucker, and
Filip Petrušev. As part of the trade, the Clippers dealt a first-round pick, two second-round picks, a pick swap, and cash considerations to the 76ers, while sending a pick swap and cash considerations to the
Oklahoma City Thunder. On July 15, 2024, he re-signed with the Sixers on a two-year, $16 million contract.
Utah Jazz (2025) On February 6, 2025, Martin and two future second-round picks (2027 via Milwaukee; 2031 via Dallas) were traded to the
Detroit Pistons. Several hours later, he was traded to the
Utah Jazz in a five-team trade, including
Jimmy Butler to the Warriors. Martin made 19 appearances (nine starts) for the Jazz, averaging 6.3 points, 2.8 rebounds, and 1.5 assists. On September 23, Martin was waived by the Jazz.
Ningbo Rockets (2025–present) On November 15, 2025, Martin signed with the
Ningbo Rockets of the
Chinese Basketball Association. ==Career statistics==