Floyd Mayweather Jr says he will knock out Manny Pacquiao if and when boxing's two biggest stars meet in 2010.The American and the Philippines star, 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."The Staples Center in Los Angeles, home of the NBA's Lakers, is the latest venue to bid for the fight.Promoters of both fighters were due to visit the new Dallas Cowboys stadium on Wednesday, but Mayweather's camp pulled out at the last minute.It is likely Mayweather, who lives and trains in Las Vegas, would prefer the fight to be in his home town, and the MGM Grand casino would now appear to be the favourite to host the bout.Representatives of the New Orleans Superdome are also said to be interested in hosting arguably the biggest fight since the turn of the century.But any venue not in Las Vegas would have to offer more money because Nevada gives fighters tax breaks that other states do not.Both Cowboy Stadium and the New Orleans Superdome can accommodate up to 100,000 spectators, while the MGM Grand seats about 16,000.The latter venue staged both boxers' last fights - Filipino Pacquiao 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]."Source: BBC