A second-round Super Six bout between Allan Green and WBA super middleweight champ Andre Ward has been postponed.

Ward said his right knee gave out during training camp. It was the same knee he had surgery last year.  

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Organizers haven't announced a new date for the fight, which was orginally set for April 24,  The second bout, part of split double header, between Carl Froch and Mikkel Kessler will go on as planned.

It's the second fight in the Super Six that has been postponed. Arthur Abraham-Andre Dirrell fight was pushed back after Dirrell developed back problems.