Showtime's groundbreaking super middleweight tournament has been dealt another setback. An industry source confirmed to SI.com that the Oct. 2 fight between Carl Froch and Arthur Abraham has been postponed after Froch sustained a back injury during training camp.

The cancellation comes on the heels of former champion Mikkel Kessler's withdrawal from the Super Six World Boxing Classic because of an eye injury. Showtime had hoped to keep the tournament going by removing Kessler's scheduled opponent, Allan Green, and reducing the field to Froch, Abraham, Andre Ward and Andre Dirrell. But the recent postponement puts the future of the tournament in serious doubt.

While Showtime is planning to reschedule Froch-Abraham for later this year, the network is struggling to put together the Ward-Dirrell fight. The two have been scheduled to fight on Sept. 25 for months but there has been no promotion, no venue has been chosen and no tickets have been sold. Dirrell posted on his Twitter account last week that the fight was "postponed," but Showtime has not officially announced any delay.

The network has sent letters threatening legal action to Gary Shaw, Dirrell's promoter, and Dan Goossen, who promotes Ward, if the fight does not go off on the original date or an alternative date in the fall.

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