Dallas Mavericks (2019–2020) After going unselected in the
2019 NBA draft, Reaves was named to the
Dallas Mavericks Summer League roster and averaged 12.6 points, 4.8 rebounds, 2.4 assists, 1.2 steals and one block per game over five games. Reaves signed a
two-way contract with the Mavericks on July 29, 2019. Reaves made his NBA debut on January 2, 2020, playing the final minute of the 123–111 win against the
Brooklyn Nets. On August 10, in a 122–114 victory against the
Utah Jazz, Reaves made his first career field goal scoring a layup on a backdoor cut, and also had his first career rebound and assist; he finished the game with 4 points on 2 of 4 shooting from the field, 1 rebound, and 3 assists in 14 minutes of playing time.
Rio Grande Valley Vipers (2021) On December 19, 2020, Reaves signed with the
Houston Rockets, but was waived on the same day and on January 18, 2021, he signed with the
Rio Grande Valley Vipers. Reaves played in each of the Vipers' 15 games in the COVID-shortened 2020–21 season, averaging 12 points, 2.7 assists, and 4.4 rebounds per game. Reaves scored 7 points in 28 minutes in the Vipers' 110-81 G League Quarterfinal loss to the
Santa Cruz Warriors.
Beşiktaş (2021–2022) On July 5, 2021, Reaves signed with
Beşiktaş Icrypex of the
Basketbol Süper Ligi (BSL) in Turkey. Reaves played in 23 games for Beşiktaş, averaging 5.0 points, 1.3 assists, and 2.1 rebounds per game. Beşiktaş went 15-15 and failed to qualify for the BSL playoffs.
Tofaş (2022) On September 13, 2022, Reaves signed with
Tofaş of the
Basketbol Süper Ligi (BSL). On October 26, Tofaş announced that it had parted ways with Reaves by mutual agreement. Reaves did not appear in any league games for Tofaş.
Return to Rio Grande (2022–present) On November 3, 2022, Reaves was named to the opening night roster for the
Rio Grande Valley Vipers. Reaves played in 14 games for the Vipers in the 2022–23 regular season, averaging 7.4 points, 2.7 assists, and 2.9 rebounds per game. He played in all five of the team's playoff games, including a total of 9 points in the G-League Finals, which the Vipers lost in two games to the Delaware Blue Coats. ==Bolivia national team==