Floyd Mayweather Jr believes he will knock out Manny Pacquiao when boxing's two biggest stars meet in 2010...

Floyd Mayweather Jr and Manny Pacquiao, who are regarded as the world's two best pound-for-pound boxers, are finalising plans for a welterweight meeting on 13 March.

And unbeaten Mayweather, 32, said: "He's been knocked out before and he's taken losses. I'll be victorious."

Mayweather's bold prediction comes as two NFL stadiums are reported to be bidding to host the 'superfight'.

Cowboy Stadium in Arlington, Texas, home of the Dallas Cowboys, is competing with the Superdome in New Orleans, as well as traditional boxing venue, the MGM Grand in Las Vegas.

The two stadiums could accommodate up to 100,000 spectators, while the MGM Grand seats about 16,000.

The latter venue staged both boxers' last fights - Filipino Pacquaio became a five-weight world champion following his WBO welterweight title win over Miguel Cotto in November, while Las Vegas-based Mayweather beat Mexican Juan Manuel Marquez in September.

Pacquiao's victory over Cotto completed an amazing 12 months in which he defeated ring legend Oscar de la Hoya as well as Britain's Ricky Hatton.

With the fight between Mayweather and Pacquiao expecting to surpass the previous record of $18.4m (£11,36m) for gate receipts, which was for Mayweather's bout with Oscar De La Hoya in 2007, promoters Bob Arum and Richard Schaefer are looking to maximise all possible revenues.

And Mayweather remains confident of blotting Pacquaio's record of 50 victories from 55 fights.

"Pacquiao's a good fighter but I've been around the sport a long time and I've dominated boxing for around 15 years now," the American said on HBO Television's Joe Buck Live chat show.

"No-one has defeated me yet so we'll have to see.

"The thing is, I don't want the fans to be really shocked by what will happen when we do happen to meet up because it's not going to be anything new."

Mayweather also admitted he has won and lost huge sums gambling on NFL matches in Las Vegas.

"Two weeks ago I won like a million [dollars], that was across a week of games, Monday night, Sunday and Thursday," he added.

"I didn't lose a million but I lost a couple of hundred thousand. Then I tried to get some 'get back' and lost some more money on Brett Favre [Minnesota Vikings quarter-back]."