By Rick Reeno

Floyd Mayweather Jr. (42-0, 26KOs), more than a decade later, still considers Emanuel Augustus to be the toughest opponent of his 16 year career.

Augustus was a much better fighter than his record presented, and he upset plenty of opponents who took him lightly based on his win-loss credentials.

Mayweather admits that Augustus made him work very hard to secure a ninth round stoppage.

"Emanuel Augustus was my toughest fight. He was tough. At that particular time, that was my longest layoff. I was a fighter who was active and fighting every three or four months. I took nine months off and fought a guy who was active and he made me bite down. It was a great night," Mayweather said.

On May 5th, Mayweather challenges Miguel Cotto (37-2, 30KOs) for the WBA's junior middleweight title at the MGM Grand in Las Vegas. HBO pay-per-view will carry the event.