Nate Robinson.
Nate Robinson
Nate Robinson...again!
There was no NBA Slam Dunk contest in 1998 Due to a lockout.
Yes he won the 2011 slam dunk contest
Terrence Ross of the Toronto Raptors won the 2013 Sprite Slam Dunk Contest.
Dwight Howard won the slam dunk contest in 2008. It was one of the best slam dunk contest, i suggest you watch it.
Brandon Dean from the University of AR-Kansas
Nate Robinson was the winner of the 2010 Slam Dunk competition. Robinson became the first three-time Slam Dunk champion, after winning in 2009 and 2006 as well.
Terrence Ross of the Toronto Raptors won the 2013 Sprite Slam Dunk Contest.
LeBron has never won, or competed, in an NBA dunk contest.
Gerald Green
There are plenty of good dunkers who haven't won the slam dunk contest.