Boston Celtics (2019–2021) On June 20, 2019, Waters was selected with the 51st overall pick in the
2019 NBA draft by the
Boston Celtics. Waters played for the Celtics during the 2019
NBA Summer League season and averaged 10.0 points, 5.3 assists, 2.0 rebounds, and 2.0 steals in 22.5 minutes through the first four games helping the Celtics clinch the number one seed going into the tournament. On July 12, 2019, Waters' father was found dead at a Super 8 Hotel room in
West Haven, Connecticut in an apparent suicide. Despite this, Waters played 32 minutes in the tournament game the following day, July 13. The Celtics fell short to the
Grizzlies and were eliminated from Summer League Championship contention despite a 16-point effort from Waters. Waters concluded his 2019 Summer League run leading the team in minutes per game as well as averaging 11.2 points, a team high 4.8 assists, and 2.0 steals. He scored 24 points in two games in the
NBA G League in November. On November 24, the Celtics recalled Waters after an injury to
Kemba Walker. On January 9, 2020, Waters posted 30 points, seven assists and five steals for Maine in a 120-118 triple overtime win over the
Capital City Go-Go. He averaged 18.0 points, 7.3 assists, 3.2 rebounds and 1.89 steals per game in 36 G League games. On November 23, 2020, Waters re-signed with the Celtics.
Wisconsin Herd (2021) On September 27, 2021, Waters signed with the
Milwaukee Bucks. However, he was waived prior to the start of the season. In October 2021, he joined the
Wisconsin Herd as an affiliate player. In 13 games, he averaged 17.2 points on .421/.364/.714 shooting, 6.0 assists, and 2.7 steals in 31.5 minutes per game.
Toronto Raptors (2021–2022) On December 22, 2021, Waters signed a 10-day contract with the
Toronto Raptors.
Return to the Herd (2022) After his 10-day contracts expired, Waters was reacquired by the
Wisconsin Herd. He averaged 15.4 points, 2.5 rebounds and 6.9 assists per game.
South Bay Lakers (2022) On February 24, 2022, Waters was traded, along with a 2022 second-round pick, to the
South Bay Lakers in exchange for
Frank Mason III and a 2022 first-round pick. joining them after South Bay's season ended. Tremont made his debut on April 11, 2022, powered Carolina's offense throughout the season, averaged 17.8 points and 8.0 assists 1.7 steals per game. He was selected as BSN Rookie Of The Year 2022 and leading in assists. Waters joined the
Memphis Grizzlies for the
2022 NBA Summer League. On July 26, 2023, Waters helped the Gigantes to win their first BSN title against the defending champions
Vaqueros de Bayamón. They dominated the Vaqueros in five games.
Metropolitans 92 (2022–2023) On July 23, 2022, Waters signed with
Metropolitans 92 of the
LNB Pro A.
Return to Carolina (2024) On May 24, 2024, Waters signed with the
Gigantes de Carolina of the
Baloncesto Superior Nacional.
Shanghai Sharks (2024) On September 10, 2024, Waters signed with the
Shanghai Sharks of the
Chinese Basketball Association (CBA). ==National team career==