A moment that he bitterly regrets to this day .
It was the last time Mayweather lost in the ring -- he is now unbeaten in 47 pro fights -- but Todorov 's victory was quickly followed by the moment that completely changed his life .
A moment that Mayweather bitterly regrets to this day .
It was the last time Mayweather lost in the ring -- he is now unbeaten in 47 pro fights -- but Todorov 's victory was quickly followed by the moment that completely changed his life .