Another excerpts from one article:

Mayweather-Marquez. Golden Boy Promotions announced yesterday that Mayweather had suffered a rib injury and the Marquez fight is off, at least for the time being. I'm not the sort to doubt training injuries absent evidence, but there is a lot of suspicion out there about whether there were other motives at work here. I make no judgement on those suspicions, although they do point to other interesting items that warrant discussion anyhow. Suspicion #1 is that Mayweather-Marquez tickets aren't selling well and therefore it would be embarrassing to Mayweather if the trend continued between now and July 18. That raises a question that I'll get to in a minute, but my first reaction is: It serves you right, Mayweather. Tickets, from what I've been told by friends of this site, are absurdly overpriced. That's the consequence of demanding $15 million for a fight that is, according to many, a mismatch between a welterweight and lightweight. And, of course, it's thought a bad style match-up, featuring one fighter who isn't yet proven as an A-side (Mayweather) and another fighter who is popular in Mexico but not as popular as he ought to be (Marquez). If this fight isn't selling, can everyone who admires Mayweather for his money-making and "business" skills as opposed to his actual in-ring performances and opponent choices please, please, go to the emergency room and have themselves de-superglued from his jock? Especially since Mayweather chose his opponent so poorly if what he wanted was a 60-40 share against Manny Pacquiao down the line; Mayweather overruled advisor Al Haymon when he wanted to be on pay-per-view instead of regular HBO, and now he's dug himself quite a hole. Mayweather being a good "businessman" is a myth, because you can only get away so long with getting paid highly for taking few risks, and that chicken has, it seems, come to roost. Suspicion #2 is that Mayweather just wants to go straight to Pacquiao. As with both these suspicions, neither is very credible if Marquez has any recourse for insisting that the fight be postponed only, rather than canceled. It seems like this has to be settled one way or the other, because you can't guarantee a ton more tickets sold if the fight is moved to September around Mexican Independence Day, as is being discussed, which means Mayweather would still be screwed.