New Orleans Pelicans (2018–2020) After going undrafted in the
2018 NBA draft, Williams signed with the
Denver Nuggets for NBA Summer League play. On July 24, Williams signed a deal with the
New Orleans Pelicans. Williams later made his professional, NBA debut on October 17, 2018, in a blowout win over the
Houston Rockets. During his rookie season, he was assigned to the
Westchester Knicks of the
NBA G League, making his G League debut on November 23. On January 30, 2019, Williams set a new career high in scoring with 21 points, and set personal bests in field goals (eight), three-pointers (five), assists (three) and minutes (38) in a 99–105 loss to the Denver Nuggets.
Oklahoma City Thunder (2020–present) On November 24, 2020, Williams was part of a four-team trade in which he was sent to the
Oklahoma City Thunder. On July 20, 2022, Williams re-signed with the Thunder on a four-year, $27.2 million contract extension. On March 2, 2023, the Thunder announced that he suffered a left wrist injury and would undergo surgery to address the issue, ending his 2022–23 season. On February 7, 2023,
LeBron James broke the all-time NBA scoring record whilst being defended by Williams. On September 18, 2024, Williams underwent an
arthroscopic debridement procedure on his right knee. He made 67 appearances (seven starts) starts for Oklahoma City during the
2024–25 NBA season, averaging 6.3 points, 3.5 rebounds, and 1.4 assists. Williams won the
2025 NBA Finals when the Thunder defeated the
Indiana Pacers in seven games. On September 29, 2025, Williams underwent an arthroscopic procedure on his left knee. ==Career statistics==