It depends on how bad, some KO losses end careers, others end lives. Boxing is young man's sport and fighters have been known to grow old in the space of one punch. Provided Floyd isn't seriously injured, he will fight the rest of the four fights he owes ShowTime and retire a first ballot hall of famer. One thing that is certain, this fight will be the toughest of Mayweather's career win or lose.

Well Mayweathers legacy is already sealed he is a future hall a famer and 5 weight division champion but if canelo wins then he will be the new PPV attraction.

I hope Mayweathe gets knocked out he talks too much ****! I know there would be a rematch if Mayweather lost

No, he is already a legend in the sport and future hall of famer.

His undefeated record didn't make him. His skills did.

Nothing will happen. Boxers win and lose all the time.

He just won't be the P4P king anymore

Would it tarnish mayweathers career

As a boxer I hate this fight for Mayweather.this is not a dumb bull headed fighter.this is a strong very talented SMART fighter and Canelo himself has great head movement and has proven he can drop anyone.I just feel this might be a harder fight than Mayweather thinks