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K9 has long been one of my favorite fighters in the sport. Ever since his run on The Contender, he's actually put together a very nice career. He's not lost a fight in four years, and was able to win the IBF light middleweight title in the process.
K9 is 39 years old, but still has a lot left in the tank.
I guarantee you that he would accept a fight against Miguel Cotto without even hearing what he was going to get paid, because it would be the biggest check of his career. Not to mention, if he could win, it would set him up for yet another huge payday down the road as he closes out his career.
K9 is a real solid fighter, and after a career in which he's dealt with a lot of promotional issues, and always been underestimated, he deserves a chance to make some money and get a big fight.
As far as Cotto is concerned, he'd view this as a way to get another world title quickly in a fight that's a little easier than a matchup against the other guys on this list.