can any fighter right now actually beat floyd mayweather??

Would you match anyone to beat floyd mayweather right now? Pacquiao? Lets face it, after Pac's last fight the majority of people think he would be countered and pot shotted to death by floyd and the odds are that he will. Cotto? Cotto has some skill left after his whooping from marg and pac but he struggled with mosley and has he really got the pressure to take out mayweather? His left body shot that he seems to of abandoned would be his biggest tool, but floyds right elbow will probably block that. Marg, Mosley? Well we know the answer to Mosley, Marg is past prime and a punching bag right now. Martinez, Alvarez? Would prob have to fight him at 147 to floyd's advantage, and he would just pick them apart. Anyone else?! and don't say berto or ortiz. IMO mayweather will retire (when he decides to) undefeated. We now again seeing that he can still do an offensive array of attacks since he was still 'pretty boy' and hungry. This guy has both amazing defense and can choose to be offensive when he wants. He claims he has only ever used his 'C' game and we can see that now with his attacking skill coming forward. I'm a fan of all boxers and appreciate the blood and sweat to be at that level, but lets be realistic..As of right now Mayweather is unbeatable!? Someone, give me another perspective!