2021–22 season in 2022 Reaves went
undrafted in the
2021 NBA draft. He said he declined to be selected 42nd overall by the
Detroit Pistons, opting instead to sign a
two-way contract with the
Los Angeles Lakers on August 3, 2021. On September 27, he was signed to a standard NBA contract. On October 22, Reaves made his NBA debut, scoring eight points off the bench in a 115–105 loss to the
Phoenix Suns. On December 15, he scored 15 points, on 5-of-6 shooting from three, grabbed seven rebounds, and hit a game-winning three-pointer in a 107–104 victory over the
Dallas Mavericks. During the Lakers' season finale on April 10, 2022, in a 146–141 overtime win over the
Denver Nuggets, Reaves notched the first
triple-double of his career, and put up career highs in rebounds, and previously assists, with 16 rebounds and 10 assists along with 31 points in 42 minutes.
2022–23 season On March 19, 2023, Reaves scored a then career-high 35 points with six rebounds and six assists off the bench in a 111–105 win against the
Orlando Magic, in which he scored the final 10 points for the Lakers. On April 16, in game 1 of the first-round playoff series against the
Memphis Grizzlies, the first NBA playoff game of his career, he scored 23 points in a 128–112 win. He matched that performance in game 4 of the same series, leading the Lakers in scoring in a 117–111 overtime victory. His successful rookie year led to him receiving the nicknames "Hillbilly Kobe", "White Kobe", and "AR-15", although Reaves himself publicly expressed dislike for such nicknames.
2023–24 season On July 6, 2023, Reaves re-signed with the
Los Angeles Lakers on a four-year, $54 million contract. He started the first eight games of the
2023–24 season for a streak of 34 consecutive starts, dating back to the 2022–23 regular season and playoffs, before coming off the bench for 15 points and seven assists against the Suns in the Lakers' first road win of the season. On December 9, 2023, Reaves and the Lakers won the
inaugural season of the
NBA In-Season Tournament. Reaves scored 28 points off the bench in the
championship game against
Indiana. In his next game, on February 1, 2024, he put up 32 points on a career-high seven three-pointers made in a 114–105 win over the
Boston Celtics. In his next game on February 3, his first at
Madison Square Garden, Reaves provided 22 points, six rebounds, seven assists, and two blocks as the
Los Angeles Lakers beat the
New York Knicks 113–105, including four free-throws down the stretch. Playing without
LeBron James on March 26 against the
Milwaukee Bucks, Reaves had a triple-double with 29 points, 14 rebounds, and 10 assists in a 128–124 road win in double overtime.
2024–25 season On December 25, 2024, Reaves scored the game-winning layup and finished with a triple-double of 26 points, 10 rebounds, and 10 assists in a 115–113 win over the
Golden State Warriors. On December 28, Reaves put up a career-high 16 assists in a 132–122 win over the
Sacramento Kings. On January 17, 2025, Reaves scored a then career-high 38 points in a 102–101 win over the
Brooklyn Nets. Reaves later broke this record on February 8, scoring 45 points in a 124–117 win over the
Indiana Pacers. With that performance, Reaves became the fourth Laker in the last twenty years to score at least 45 points, joining
Kobe Bryant, LeBron James and
Anthony Davis. Further, Reaves is only the sixth Laker ever to score a statline of 45 points, 7 rebounds and 7 assists. On April 3, 2025, Reaves had 31 points, 6 rebounds and 3 assists in a game against the
Golden State Warriors. Reaves made 9 3-pointers, with a majority of them coming in the 4th quarter. Reaves also passed Lakers great
Kobe Bryant for the second-most 3-point field goals in a season in Lakers history.
2025–26 season On October 26, 2025, Reaves had a near-triple-double of 51 points, 11 rebounds, and 9 assists in a 127–120 win over the
Sacramento Kings. His 51 points set a career-high, and he became the eighth Laker to score 20+ free throws in a single game. He also made his 500th three-pointer of his career. On October 29, Reaves scored a game-winning, buzzer-beating floater and finished with 28 points and a career-high-tying 16 assists in a 116–115 victory against the
Minnesota Timberwolves. == National team career ==