Welterweight titlist Devon Alexander's title defense against mandatory challenger Kell Brook of England was postponed for a second time on Monday after Alexander suffered a right biceps injury.
The fight was scheduled to headline a Feb. 23 Showtime card at the Masonic Temple Theater in downtown Detroit.
Kevin Cunningham, Alexander's trainer and manager, told ESPN.com that Alexander suffered a "severe strained right biceps" after hitting a heavy bag with a right hook during a recent training session.
Golden Boy Promotions chief executive Richard Schaefer told ESPN.com that the rest of the card would still go on Feb. 23, with the main event being moved to a date to be determined.
"Alexander has a biceps injury," Schaefer said in an email from the airport in New Orleans as he was getting ready to leave after attending the Super Bowl on Sunday night. "The fight will have to be postponed. I don't know more at this point [but] the rest of the card will go on."
The card will now be headlined by Cornelius "K9" Bundrage (32-4, 19 KOs), who is from Detroit, making his third defense when he faces Ishe Smith (24-5, 11 KOs) of Las Vegas. Also on the card, middleweight prospect J'Leon Love (14-0, 8 KOs) of Detroit is scheduled to face long-faded 41-year-old former junior middleweight titlist Bronco McKart (54-10-1, 32 KOs), of Monroe, Mich., in a scheduled 10-round bout.
Alexander-Brook was originally scheduled for Jan. 19 at the Nokia Theater in Los Angeles, but when Brook injured his ankle in mid-December, the fight was postponed until Feb. 23.
Now it is delayed again because of Alexander's injury.
"We heard that Devon has picked up a biceps injury and are waiting for a new date," said Matchroom Sport's Eddie Hearn, Brook's promoter. "Obviously, we are bitterly disappointed, but that's boxing, and we will keep focused while we wait for the new date."
St. Louis' Alexander (24-1, 13 KOs), also a former unified junior welterweight titleholder, won a version of the 147-pound title Oct. 20 with a lopsided decision against Randall Bailey at the Barclays Center in New York. On the same day, in his hometown of Sheffield, England, Brook (29-0, 19 KOs) knocked out Hector Saldivia of Argentina in a final elimination bout to become Alexander's mandatory challenger.