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If his fight against Andre Berto was really his last, Floyd Mayweather is ending his career with 49 wins and 0 losses. That final win, of course, came against Berto on Saturday, when Mayweather won in convincing fashion. 

And Mayweather knew he was going to win. At some points during the fight, Mayweather appeared to be clowning around inside the ring, as if he knew Berto wasn't going to come close to topping him. 

In the video above, you can see just how confident Mayweather was throughout the fight. The clip, which is taken just moments before the final round of Mayweather's career, shows Mayweather and his father, Floyd Mayweather Sr., interacting in the corner. 

Mayweather thanks his father and Mayweather Sr. tells him that the fight is already his. 

"Everything's done already," Mayweather Sr. says in the video.

Not long after, Mayweather sank to his knees in the middle of the ring, celebrating the 49th win of his career.

Mayweather won in convincing fashion over Berto. (USATSI)