Next up for Floyd Mayweather...

Floyd Mayweather said he’s going to fight again in May and September, as part of his six-fight deal with SHOWTIME. The question is who is left?

Everyone wants to fight Mayweather. In addition to wanting to become part of history by fighting the word’s finest boxer, it’s an easy way to get rich. These days, anyone who fights Mayweather is pretty much guaranteed to earn the biggest pay check of their career.

Here are a few candidates, hopefuls and long shots:

Danny Garcia, junior welterweight: After a sterling performance against Lucas Matthysse on the Mayweather undercard, Garcia has become a hot topic of debate. Two things that could prevent a Mayweather-Garcia bout happening in May: Does the Philadelphia native have a big enough name? And is he ready to move up to welterweight. His fine performance on Saturday notwithstanding, Garcia is still a relatively unknown commodity to the casual boxing fan. There’s no chance Mayweather would drop under welterweight to fight anyone.

Sergio Martinez, middleweight: Mayweather mentioned Martinez as a possible opponent after his fight against Shane Mosley. Martinez hasn’t fought below 158 pounds since his second-round KO of Paul Williams on Nov. 20, 2010. Would Martinez be willing to drop down to junior middleweight to fight Mayweather? For a purse that could be in the $8 to $10 million range, probably? But there’s one hitch to this, Martinez is locked in with HBO, making the possibility of a fight between the two anytime soon out of the question.

Amir Khan/Devon Alexander, welterweight: Khan and Alexander were in negotiations to fight on Dec. 7. No deal has been made, but if this bout does happen, the winner might be in line for a shot at Mayweather. But would there be enough time to promote a May fight? There should be, especially since Mayweather only took four months off between his last two fights. Khan would be a particularly interesting matchup for Mayweather because he has a huge fan base in England. The British TV money would certainly make Mayweather amenable to a fight with Khan. Alexander doesn’t have the international appeal of Khan, but he is an excellent young fighter with just one loss. And it’s worth noting that Mayweather mentioned Alexander has a possible opponent before he announced his deal to fight Guerrero.

Manny Pacquiao, welterweight: Until one of the two retires, the possibility of a Mayweather-Pacquiao bout will never die. A few issues need to be ironed out for this to happen: Bob Arum/Top Rank must mend the fences with Golden Boy Promotions. Until those two promotional giants can meet in a room together to hammer out a deal, we’ll never see this matchup. And Pacquiao absolutely, positively has to beat Brandon Rios on November 23 in China. And he needs to look good doing it.

Timothy Bradley, welterweight: Much to the chagrin of many, Bradley’s career hasn’t taken off since his controversial win over Pacquiao in 2012. But he will square off against Juan Manual Marquez on October 12. A solid win against Marquez could put him in line to fight Mayweather. But much like the Mayweather-Pacquiao scenario, there are obstacles: Bradley is promoted by Top Rank. And can Bradley sell tickets? Despite his marvelous talent, Bradley has never been huge draw to the box office. Then again, if Mayweather is willing to fight the likes of Victor Ortiz and Robert Guerrero, he would certainly be willing to fight Bradley under the right circumstances.

Canelo Alvarez, junior middleweight: Considering the fact that Mayweather has only fought one fighter more than once (Jose Luis Castillo), can’t see a rematch happening, at least not anytime soon.

Gennady Golovkin, middleweight: Golovkin recently said it is his “dream” to fight Mayweather. But the weight difference just might be too much for both fighters.

Adrien Broner, lightweight: No chance. As long as Broner is considered Mayweather’s protégé, no way does this fight happen…Juan Manuel Marquez, welterweight: We saw this one already and it wasn’t much of a fight…Paul Malignaggi, welterweight: Malignaggi has had an excellent career, but at this point he doesn’t have the power to make it a competitive fight...Austin Trout, middleweight: His stock was way up until his loss to Alvarez.