Floyd Mayweather said "the world will stop" when he fights Manny Pacquiao on 2 May as they were face-to-face for the last time before the weigh-in.
Mayweather, who has won all 47 of his fights, told Pacquiao at a press conference in Los Angeles on Wednesday that he was not ready to taste defeat.
Pacquiao had earlier said that he would beat the American for the good of boxing.
The Filipino fighter has a record of 57 wins, two draws and five losses.
"May 2 - the world stops. Mayweather v Pacquiao is the biggest fight in history," Mayweather said.
The fight, which has been the subject of on-off contract negotiations over six years, is expected to generate as much as £162m ($250m).
Mayweather, who has won all 47 of his fights, told Pacquiao at a press conference in Los Angeles on Wednesday that he was not ready to taste defeat.
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| Floyd Mayweather And Manny Pacquiao Were Face-To-Face |
The Filipino fighter has a record of 57 wins, two draws and five losses.
"May 2 - the world stops. Mayweather v Pacquiao is the biggest fight in history," Mayweather said.
The fight, which has been the subject of on-off contract negotiations over six years, is expected to generate as much as £162m ($250m).
Who won the verbals?
In low-key speeches in front of about 700 media, both fighters spent more time talking up the fight than aiming barbs at their opponent.
Mayweather, 38, suggested that his unblemished record may give him a psychological advantage over Pacquiao, claiming that "if you lose, it is always in your mind", but also praised the Filipino's camp for making the fight happen.
"I have to be thankful that we have all come together as one to give the world what they want to see," he added.
