Quinn, who originally signed with the HEAT on July 6, 2006 as a free agent, has appeared in 102 games (26 starts). During his two-year NBA career in Miami, he has averaged 5.9 points, 2.4 assists, 1.5 rebounds and 17.1 minutes while shooting 40.9 percent from the field, 38.9 percent from three-point range and 81.5 percent from the foul line. In his 26 career starts, he has averaged 11.7 points, 4.9 assists, 3.1 rebounds, 1.42 steals and 32.8 minutes while amassing a 3.18 assist-to-turnover ratio and shooting 42.7 percent from the field, 40.4 percent from three-point range and 85.3 percent from the foul line. Additionally, Quinn has scored in double-figures on 27 occasions, including four 20-point performances.
During the 2007-08 season, Quinn appeared in 60 games (25 starts) and set career-highs with 7.8 points, 3.0 assists and 2.0 rebounds in 22.3 minutes. He finished tied for 27th in the NBA in three-point field goal percentage, connecting on 40.3 percent of his attempts. Quinn also ranked second on the HEAT in assist-to-turnover ratio (3.24) and three-point field goal percentage and fourth in three-point field goals made (64), assists (178) and steals (46). He became just the 14th player in HEAT history to play all 48 minutes of a non-overtime game when he played for the duration at Toronto on March 19, 2008.