I dont even know of 5 people that Floyd can fight...as bad as some of these guys' gates are, let alone, some of them wouldn't even headline a PPV if they fought each other. Im really speaking of the guys that are coming up from Jr. WW, or planning to.
I was always a firm believer that Khan would make the cut for a Mayweather fight, but after he went life & death with Lamont, while managing to look like an amateur in the process, I believe he screwed himself. With Floyd...you never know though.
All I can really think of is Alvarez (due to high ticket sales and popularity), but he has to get past Shane in May...so he better not even think of asking for a Mayweather fight, if he manages to get his clock cleaned by Mosley.
Martinez...nope. Poor guy cant land a meaningful fight to save his life. Besides he's been at Middleweight for 2 years now, and he's still trying to convince himself and the world, that he's a small MW.
Nice try Sergio...and he cracks me up because he's willing to "comfortably" make 154 for a Floyd fight, but when asked about James Kirkland, he said that James would have to move up to 160.

Give it a rest Sergio...