He has defeated Sugar Shane Mosley, Oscar De La Hoya, Miguel Cotto and Marquez, among others.
Giving fans what they want to see will help Cotto the fighter and Cotto the business.
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However, many spectators saw it as much closer and some even gave Cotto the edge.
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The crowd loved Cotto's work and seemed to explode every time Cotto landed a punch.
WSJ: Boxer Floyd Mayweather Wins Fight Against Miguel Cotto in Unanimous Decision in Las Vegas
Cotto sat on the other side, in a gray suit and his own towering chair.
Cotto, who pummeled Antonio Margarito at Madison Square Garden in December, was praised as a robust opponent.
Cotto kept his hands high but Mayweather was frequently able to penetrate his foe's defenses with his jab.
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Cotto was making the fifth defence of the title he won in 2 December 2006 by knocking out Carlos Quintana.
After Mayweather fights Cotto, Pacquiao himself will meet the less-than-household name Timothy Bradley Jr. on June 9 in Las Vegas.
On Tuesday, Mayweather was occasionally showered with boos from the pro-Cotto crowd, but each time he smiled, as if unruffled.
Cotto, 32, is just getting started in the fight promotion game and this fight will help establish him in the business.
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In the seventh round a pair of Margarito upper-cuts found their mark and rattled Cotto, who began to bleed from his nose.
But he had never fought Mayweather, who got hit more than normal in his last fight against Miguel Cotto a year ago.
"After the Cotto fight I realized my defense wasn't what it should be and I had to hone my skills, " Mayweather said.
The bout is likely to top the 1.5 million audience for Mayweather-Cotto.
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Arum exited the Mercedes to a scrum of photographers waiting for Cotto.
Cotto will earn less for the Trout fight than he would have against Pacquiao, but it could pay off in the long run.
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Australia's Kostya Tszyu remains the man to beat, but WBO champion Miguel Cotto, another Puerto Rican, is being touted as his heir apparent.
It had already been a goofy start for the Tuesday press conference promoting Mayweather's May 5 fight against Miguel Cotto in Las Vegas.
But Cotto walked away from a huge payday this time in a dispute over money and the weight the fight would take place at.
FORBES: Miguel Cotto Faces Austin Trout On Showtime And Builds His Brand
Last year, Mayweather was forced to brawl with the rugged Cotto.
Margarito continued to chase his opponent down and inflicted further damage towards the end of the 10th round, sending Cotto back to his corner clearly exhausted.
Mayweather's win over Cotto last May drew 1.5 million pay-per-view buys, his biggest sales since he and De La Hoya combined for a record 2.5 million.
His company, Miguel Cotto Promotions, is promoting the fight with help from Golden Boy Promotions, which was founded by 10-time world champion Oscar De La Hoya.
FORBES: Miguel Cotto Faces Austin Trout On Showtime And Builds His Brand
Mr Pacquiao's defeat of Miguel Cotto, a Puerto Rican, means he has now won world championships in seven different weight divisions a feat unprecedented in boxing history.
But Margarito, four inches taller than his opponent, continued to stalk Cotto and eventually began to wear down the smaller man by trapping him against the ropes.
Miguel Cotto is one of the biggest stars in boxing.
FORBES: Miguel Cotto Faces Austin Trout On Showtime And Builds His Brand
His opponent is still to be determined with the leading contenders being Bradley, Marquez for a fourth time or Miguel Cotto, who lost to Mayweather in May.
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The car began to wind its way through the narrow streets near the 1 World Trade Center construction, toward the Trinity Boxing Club, where Cotto would be training that afternoon.
When he fought last May against Miguel Cotto the worry among his fans was that he would be distracted by an upcoming jail sentence, though that turned out to be unfounded.
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