July 18th's mega fight between Floyd Mayweather and Juan Manuel Marquez has been called off due to a rib injury sustained by Mayweather while training.

Mayweather officially ended his retirement on May 2 when he announced he would fight Marquez. They were scheduled to fight at a catch-weight of 144 pounds, more than Marquez has ever fought and the lightest weight for Mayweather since 2005.

Mayweather hasn't boxed since knocking out Ricky Hatton in December 2007. The former five-division champ was slated to fight a rematch with Oscar De La Hoya but instead abruptly retired last June, turning his attention to show business.

As of now, the plan is to reschedule the fight as soon as possible and not to cancel the fight entirely or to have either man move onto another opponent.

The Pretty Boy and Dinamita are set to take the stage on July 18 at a catch weight of 145 lbs.

The summer showdown between Mayweather (39-0, 25 KO's) and Marquez (50-4-1, 37 KO's) will be promoted by Mayweather Promotions and Golden Boy Promotions in association with Marquez Promotions.

Not only are they two boxers destined for the Hall of Fame and two of the greatest technicians of this era, but they also both have a warrior's spirit that comes out when they get tested. Floyd Mayweather Jr. stands at 5'8" while Juan Manuel Marquez is 5'7". There's just an inch that separates the two.

When it comes to styles, they are both defensive fighters as Juan Manuel Marquez is known to be the best counter puncher in his division and Floyd Mayweather Jr. has a solid defense as well, with his shoulder rolls and great footwork.

Juan Manuel Marquez (prorecord 50-4-1 met 37 KO's) hold titles as the Former featherweight world Champion, Former Super featherweight world Champion, Current WBA, WBO and IBO lightweight world Champion.

Marquez, who just last year weighed 129 pounds for a fight against Pacquiao and has only fought twice as a lightweight. Though moving up in weight, Marquez is still considered a dangerous opponent, and many thought he won both his fights against Pacquiao.

Marquez has recently knocked out Casamayor and Diaz, while Mayweather put down Hatton in his last fight. Juan Manuel Marquez will be the underdog here. But my prediction on the outcome is different.

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