Green had a stellar amateur career despite not making the Olympic Games, winning the 2002 National Golden Gloves, at 178 lbs, and compiling a 55–6 record.

[1] Green made his professional debut on November 9, 2002, with a one-round TKO victory against Robert Dykes, in his fourth fight he outpointed Ola Afolabi.

Green's career was on the upswing, and he made his ShoBox (a notable prospect show) debut with a 7-round TKO victory against Rocky Smith.

Green stunned Codrington and pinned him to the ropes, then threw brutal combinations before finishing with a left hook to the chin.

On October 19, 2007, at the Buffalo Run Casino in Miami, Oklahoma, Allan Green stopped Sherwin Davis in two rounds.

Green, fighting for the first time since July (w ko 1 Darrell Woods), and following abdominal surgery, had Davis down twice in round one before closing the show.

Green recently was forced to turn down an HBO-televised meeting with Andre Ward, who represented the U.S. in the 2004 Olympics, capturing the gold medal in the light heavyweight division.

Green then fought on April 25, 2009, at Foxwoods Resort, Mashantucket, Connecticut, on the under card of the Jermain Taylor vs. Carl Froch fight.

Green was selected as his replacement and challenged World Boxing Association super middleweight champion Andre Ward on June 19.