Floyd Mayweather Jr. signed off from professional boxing as he had planned on Saturday, going out unbeaten and on his own terms as ‘The Best Ever' after improving his career record to 49-0. After a stellar 19-year run that produced world titles in five weight divisions and earnings in excess of $800 million, Mayweather bade farewell to the ring with a clinical display to earn a unanimous decision over fellow American Andre Berto.Mayweather, who matched the 49-0 career record set by former heavyweight champion Rocky Marciano, is widely regarded as one of the best defensive practitioners of all time.