St. Louis Hawks After the
Los Angeles Lakers and
Cincinnati Royals made territorial picks, the
St. Louis Hawks took Mullins in the first round (5th pick overall) of the
1964 NBA draft. The Hawks moved Mullins from forward to guard, a difficult transition for Mullins. In two seasons with the Hawks he was a fourth guard under player-coach guard
Richie Guerin, who never gained confidence in Mullins. Mullins played in 44 games as a rookie (1964–65), averaging 11.2 minutes and 4.9 points per game. The following season with the Hawks (1965–66) he suffered knee and ankle injuries, and again played 44 games, averaging 13.3 minutes and 5.8 points per game. After some delay that was resolved by the NBA, in October 1966 Mullins and shooting guard Jim King were sent to the
San Francisco Warriors in exchange for point guard
Guy Rodgers. Rodgers had been traded earlier from the Warriors to the Bulls, who were seeking taller guards in place of the 6 ft (1.83 m) Rodgers.
San Francisco/Golden State Warriors In the 1966–67 season, Mullins joined a Warriors team with two future Hall of Fame players: 22-year old forward
Rick Barry and 25-year old center
Nate Thurmond. The Warriors played under head coach
Bill Sharman, later in the Hall of Fame as both a coach and a player. Mullins' playing time increased under Sharman. Mullins started his first NBA game in January 1967. Soon after, he scored over 20 points in three games over three consecutive days (January 29–31); playing over 30 minutes per game even when not starting. Mullins played in 77 games for the Warriors in 1966–67, averaging 23.8 minutes per game. He averaged 12.9 points, five rebounds, and 2.9
assists per game, with a team-high .458
field goal percentage. The Warriors had a 44–37 record and finished first in the NBA's Western Division. The Warriors swept the
Lakers in three games to win the
Western Division semifinal playoff series. Mullins averaged 13.7 points, 8.3 rebounds and 2.3 assists per game in the series. The Warriors then defeated the
Hawks in six games in the Western Division finals. Mullins averaged 38.5 minutes, 23.3 points, six rebounds and 4.5 assists per game against his old team. The Warriors lost the 1967 NBA championship in six games to the
Philadelphia 76ers, who featured four future Hall of Fame players on their team (
Wilt Chamberlain, Billy Cunningham,
Hal Greer and
Chet Walker). Mullins averaged 32 minutes, 14 points, five rebounds and four assists per game in the series. After the season, Barry, who led the NBA in scoring (35.6 points per game) and averaged nearly 41 points per game in the NBA finals, attempted to leave the Warriors to join the
American Basketball Association's
Oakland Oaks. A court ruled he could not do so, and rather than play for the Warriors, he sat out the 1967–68 season. That season Mullins playing time increased to 35.5 minutes per game, at shooting guard. He averaged 18.9 points, 5.7 rebounds and 4.4 assists per game; playing in 79 games. The Warriors fell to third in the Western Division (43–39), but still made the playoffs. The Warriors faced Guerin and the Hawks in the first round of the
Western Division playoffs. The Hawks were first in the Western Division with a 56–26 record. The Warriors upset the Hawks in six games. Mullins led all scorers in the series, averaging 27 points per game. He scored a game-high 29 points in the Warriors' Game 1 win (111–106), a game-high 33 points in the Warriors' 124–109 Game 3 victory, and a game-high 35 points in the Warriors' Game 4 win. Mullins hit a 15-foot bank shot with six seconds remaining to win Game 4 by one point (108–107). After winning the emotional game, Mullins' teammates carried him off the court on their shoulders. The Lakers swept the Warriors in four games in the Western Division finals. Mullins averaged 22.3 points, six rebounds and 5.8 assists per game in that series. Over the next four seasons (1968 to 1972), Mullins averaged over 20 points per game each season and was selected to the Western Division All-Star Team three consecutive years (1968 to 1971). He was second in the NBA in
free throw percentage (.843) and 10th in scoring average. The Warriors finished the season 41–41, and lost in the first round of the
Western Division playoffs to the Lakers in six games. Mullins averaged 14.3 points and 3 rebounds per game in that series. He played 25 minutes in the
1969 All-Star game, scoring 14 points. In 1969–70, Mullins again led the Warriors with a 22.1 points per game average, along with averaging 5.2 rebounds and 4.9 assists per game. He was third in the NBA in free throw percentage (.847) and 12th in scoring average. In 1970–71, he led the Warriors in scoring for a third consecutive season (20.8 points per game). The team finished the season 41–41, and lost in the first round of the Western Conference playoffs in five games to the eventual
NBA champion Milwaukee Bucks. In that series, Mullins led the Warriors in minutes per game (41), averaging 16.4 points, 6.4 rebounds and 4.8 assists per game. He was fourth in the NBA in free throw percentage that season (.844). In 1971–72, Mullins led the Warriors in scoring for a fourth consecutive season (21.5 points per game). He averaged a career-best 5.9 assists per game, as well as 5.6 rebounds per game. The now Golden State Warriors had a 51–31 record, finishing second in the
Pacific Division. They lost to the Bucks again in five games in the first round of the Western Conference playoffs. Mullins averaged 14.8 points, 5.8 assists and 4.8 rebounds per game in the series. After five years, Barry returned to the Warriors for the 1972–73 season. The Warriors were 47–35, once again second in the Pacific Division. They defeated the Bucks in six games in the Western Conference semifinal playoff series. Mullins' 15.3 points per game was second only to Barry (16.5 points per game) on the Warriors in that series. The Warriors lost the Western Conference finals to the Lakers in five games; Mullins averaging 14.6 points, 5.6 rebounds and 4.4 assists per game. In the 1973–74 season, Mullins averaged 32.4 minutes, 16.2 points, 3.6 rebounds and four assists per game. The Warriors finished the season 48–34, but did not make the playoffs. Mullins' 1973–74 season averages were his lowest with the Warriors since his first year with the team. In his last two NBA seasons (1974 to 1976), Mullins suffered injuries that relegated him to reserve status. As a reserve guard in the 1974–75 season, he played in 66 games, averaging 17.3 minutes and 8.2 points per game. The Warriors won the Pacific Division with a 48–34 record, and then went on to win the NBA championship. The Warriors defeated the
Seattle SuperSonics in six games in the first round of the playoffs. Mullins averaged 16.7 minutes and 8.2 points per game in that series. In the
Western Conference finals, the Warriors defeated the
Chicago Bulls in seven games. Mullins averaged 19.4 minutes and 8.1 points per game in that series. In Game 2, Mullins played 35 minutes and scored 18 points in a one-point loss to the Bulls (90–89). In Game 4, the Warriors tied the series 2–2. Mullins came into the game in the second quarter and scored eight of his twelve points, in helping the team to win. The Warriors then swept the
Washington Bullets in four games to win the NBA championship. Mullins averaged 19.3 minutes and eight points per game. In his final NBA season (1975–76), Mullins hurt his knee early in the season and played little thereafter. He could have played more, but Warriors head coach and future Hall of Famer
Al Attles, who had played alongside Mullins for five years as a Warriors player, and coached Mullins for seven seasons with the Warriors, did not want to embarrass Mullins by putting him into games at "
garbage time". In the Western Conference playoffs, Mullins averaged less than five minutes per game. Mullins announced his retirement in October 1976. Upon his retirement in 1976, he had amassed a total of 13,017 points for a twelve-year career average of 16.2 points per game. In his ten seasons with the Warriors, he averaged 32.8 minutes, 17.5 points, 4.5 rebounds and 4.1 assists per game, totaling over 12,500 points as a Warrior. ==Coaching and athletic director career==