LeBron James(of course)!!!
He has never been in one
LeBron has never won, or competed, in an NBA dunk contest.
Neither is even though Lebron said he was going to bu then backed out like a pussy
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LeBron James is the man in dunking u know what im sayin. he dunks on people, or when hes open he shows some 360 or windmill dunks. by da way LeBron James has over 900 dunks already since 2009.
Jeremy Evans is the reigning Slam Dunk champion. Evans, Terrence Ross, James White, Gerald Green, Eric Bledsoe, and Kenneth Faried are participating in the 2013 Slam Dunk contest. Blake Griffin, LeBron James, and Dwight Howard are thought to be some of the best dunkers.
James Barney goes by Grand Slam.
LeBron Raymone James (pronounced /ləˈbrɒn/; born December 30, 1984) is an American professional basketball player for the National Basketball Association (NBA),LeBron James isn't the first high schooler to jump to the NBA, but he may already be the best. His basketball IQ hovers at genius level,Lebron James is hottest new talent in NBA. He was destined for greatness a long time ago and he has delivered in his first season with Cavaliers.read more at:http://www.paleez.com/lebron_james.html
mr. slam dunk: lebron MVP: wade mr. clutch: kobe mr. steals: chris paul mr. assists: chris paul
Hi won his first grand slam in the 2003 Wimbledon championships =D.
Players who are currently in the nba that have done it are: Kobe Bryant, Lebron James, Vince Carter, Derrick Williams(did a 360 dunk in the slam dunk contest), Blake Griffin, Jason Richardson, Amar'e Stoudemire(not 100% sure if he has), Rajon Rondo, JR smith.