-LRB- CNN -RRB- -- Floyd Mayweather will cement his position as the most bankable boxer in the world in Saturday night 's non-title welterweight fight against fellow American Shane Mosley in Las Vegas . The 33-year-old , whose nicknames include `` Money , '' has already generated $ 292 million in revenue in six pay-per-view fights for broadcaster HBO , from 5.5 million buys . He is expected to take home $ 58.5 million for himself if the battle with veteran Mosley achieves two million subscribers . Mayweather is already fourth on the broadcaster 's all-time list behind Oscar De La Hoya -LRB- $ 610.6 million on 12.6 million buys from 18 events -RRB- , Mike Tyson -LRB- $ 545 million on 12.4 million buys , 12 bouts -RRB- and Evander Holyfield -LRB- $ 543 million on 12.6 million buys , 14 fights -RRB- . De La Hoya and Tyson have both retired , while the 47-year-old Holyfield last month kept alive his unlikely dream of winning the world heavyweight title for a record fifth time by claiming the little-regarded WBF crown in front of just 3,000 people in Vegas . Mayweather 's 2007 victory over De La Hoya earned a record $ 120 million for a single pay-per-view event from 2.15 million buys , and HBO told CNN that his fight with the 38-year-old Mosley is set to qualify as a true `` megafight . '' `` In boxing , megafights are those that reach one million buys , '' HBO Pay-Per-View senior vice-president Mark Taffet said . `` By every indicator -- ticket sales , closed circuit television sales , views of video on the Internet , and the number of viewers of HBO 's 24/7 series -- Mayweather-Mosley is on track to becoming a true PPV megafight . `` Whether on television , radio , newspapers , magazines , Internet , Facebook , MySpace , iTunes , Youtube , HBO , or at retail stores across the country , fans everywhere are surrounded by this great event . The Mayweather-Mosley buzz is everywhere . '' Mayweather is undefeated in 40 fights , and has won six world titles at five different weights . However , he has lost his No. 1 ranking as the highly-regarded Ring Magazine 's world 's top pound-for-pound boxer to rival Manny Pacquiao . The two were due to clash earlier this year but the Filipino pulled out due to Mayweather 's demands for Olympic-style blood-testing . `` Floyd Mayweather is a bonafide PPV superstar , '' Taffet said . `` He is one of most prolific performers in PPV history . `` But it takes two to make a true megafight and , like Floyd Mayweather , Shane Mosley is a future Hall-of-Famer and one of the most recognizable boxing stars of this era . Shane is a critical ingredient in the megafight status of Mayweather-Mosley . `` While Shane and Floyd definitely have very passionate fan bases in their hometowns -LSB- Lynwood , California and Grand Rapids , Michigan respectively -RSB- , both Mayweather and Mosley are national figures with broad and diverse fan bases throughout the entire U.S. `` As the ` Who R U Picking ? ' polls indicate , fans everywhere are talking about this matchup and it is virtually a 50-50 split as to who the fans think will win . '' While many pundits expect Mayweather and Pacquiao to agree to fight by the end of this year , the American has taunted the Filipino by saying he is not enough of a box office draw . Pacquiao 's fights with De La Hoya and Juan Marquez brought in significantly fewer buys than Mayweather 's clashes with the duo . `` He needs to learn how to do numbers like I 'm doing , '' Mayweather , who shunned the chance of winning the WBA belt against Mosley as he did not want to pay the sanctioning fees , told Boxingscene.com . `` He needs to step his game up . I 'm not worried about this -LSB- Mosley fight -RSB- . I know I 'm going to do crazy numbers . I should walk away with about $ 40 million . With or without Pacquiao I 'm going to be able to go out and make $ 20 million or $ 30 million a night . ''