John Warren Marin is an American former professional basketball player. A 201 cm guard/forward from Duke University, Marin was named to the 1967 NBA All-Rookie Team and spent 11 seasons in the National Basketball Association (1966–1977), playing for the Baltimore Bullets, Houston Rockets, Buffalo Braves and Chicago Bulls. The left-handed Marin was a two-time All-Star and scored 12,541 points in his career. He led the NBA in free throw percentage during the 1971–72 NBA season.

The NBA All-Rookie Team is an annual National Basketball Association (NBA) honor given since the 1962–63 NBA season to the top rookies during the regular season. Voting is conducted by the NBA head coaches who are not allowed to vote for players on their own team. The All-Rookie Team is generally composed of two five-man lineups: a first team and a second team. The players each receive two points for each first team vote and one point for each second team vote. The top five players with the highest point total make the first team, with the next five making the second team. In the case of a tie at the fifth position of either team, the roster is expanded. If the first team consists of six players due to a tie, the second team will still consist of five players with the potential for more expansion in the event of additional ties. Ties have occurred several times, most recently in 2012, when Kawhi Leonard, Iman Shumpert, and Brandon Knight tied in votes received. No respect is given to positions. For example, the first team had four forwards, and one guard in 2008, while the first team had four centers and one guard in 2016.