Mayweather hits out at Manny Pacquiao on the eve of Berto bout

Floyd Mayweather made a snide dig towards former foe Manny Pacquiao on the eve of what he insists will be his final outing as a professional boxer.

Mayweather will put his WBC and WBA welterweight titles on the line against Andre Berto in Las Vegas this weekend, but more importantly the pound-for-pound king is bidding to end his career unbeaten and equal Rocky Marciano’s celebrated 49-0 record.