After Jamison has played three years for the University of North Carolina, he was ausgewöhlt the NBA Draft in 1998 ranked fourth by the Toronto Raptors, which meant his entry into professional basketball. Previously, he was already noticed by several awards from the College Sports, which paid tribute to his great talent (including College Player of the Year in the 1997-98 season ).
Right in the Draft night, he was, however, in exchange for Vince Carter, he traded to the Golden State Warriors, where he played until 2003. With the Warriors, he played a relatively disappointing rookie season, but was still one of the bright spots in the team of Golden State. He finished the season off with 9.6 points and 6.4 rebounds and All- Rookie Second Team was called to the NBA. Already in the following year, Jamison improved tremendously and scored 19.6 points and 8.3 rebounds per game. During his time with Golden State, he scored in the 2000 /01 season in two regular season games in succession every 50 points. This he scored against the Seattle SuperSonics, and the Los Angeles Lakers in which Kobe Bryant also scored 50 points. The fact that two opposing players each scored 50 points, had previously happened only twice. With 24.9 points per game, he finished at the end of the season in third place in the scoring list in the league. In the 2003-04 season he played with Dirk Nowitzki in the Dallas Mavericks, with whom he could reach for the first time in his career the play-offs ( Season Record: 52:30 victories; first play-off round). This season, he was also awarded the coveted Sixth Man Trophy, which honors the best replacement players in the NBA.
At the end of this season, he was traded again. His new team was then the Washington Wizards, where he could play in the 2004-05 season in the All-Star team for the first time. This year, he was also able to reach the second play-off round for the first time in his career. In 2006, Jamison failed with the Washington Wizards in the first play-off round to the Cleveland Cavaliers. 2008 Jamison was invited back into the NBA All- Star Game.
On February 17, 2010, he was traded for Žydrūnas Ilgauskas to the Cleveland Cavaliers. There he played a few more months on the side of Forward Lebron James. After leaving Jamison stayed with the Cavaliers, but the team was in 2011 and 2012 do not reach the Play Offs. However, Jamison remained an important part of the team and put Cleveland over 17 points and 6 rebounds per game.
After his contract expired in Cleveland Antawn Jamison to the Los Angeles closed for the season 2012/2013 on Lakers. There he received a one-year contract. For the Lakers came for the first time since his time in Dallas again the bench and scored 9.4 points for this and 4.8 rebounds.
Since August 2013 he was with the Los Angeles Clippers under contract. There, however, he could not as they had hoped to play a major role bench player and also missed some games due to injuries. February 2014 he was transferred from the Clippers to the Atlanta Hawks. Shortly after the trade, he was released by them.
- 2 × NBA All -Star: 2005, 2008
- NBA Sixth Man of the Year 2004
- NBA All- Rookie Second Team: 1999