Mayweather is the only guy you can say is a truly great opponent for Marquez.
Hatton and Oscar were higher up the p4p ladder than Casamayor and Juan Diaz when they fought Marquez. If anything Juan Diaz didn't look that good agianst Nate Campbell, and Casamayor didn't look that good against Katsidis.
I mean Juan gave Marquez a really tough fight, and he just arguably lost to a guy who Hatton dominated, and look what Manny did to Ricky.
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