Manny Pacquiao is confident of beating Floyd Mayweather because he is "different" to the American's 47 victims so far.
Speaking at a press conference in Las Vegas on Tuesday, Pacquiao vowed to inflict the first defeat of Mayweather's immaculate career when they collide in the early hours of Sunday morning UK time.
"I'm different to the 47 opponents he has fought before. I'm faster than them and I'm content for the fight. I believe this is the moment he will experience his first loss," Pacquiao said.
"I can't say Mayweather is the most dangerous opponent of my career because I've fought guys like Oscar De La Hoya, Miguel Cotto, Juan Manuel and Marquez and other boxers.
"He's a difficult opponent but my confidence is different for this fight. I have no nerves, maybe the people get nerves but I'm excited, this is it.
"At this point it's not personal to win, but personal for boxing fans. We have to prove something to the fans and that's personal for us.
"This is one of the most important fights for my boxing legacy. I want to make this fight for my boxing legacy. I want to win, that's my goal."
Pacquiao enters the fight as the underdog for the first time since his eight-round destruction of Oscar De La Hoya in 2008, but he relishes that role.
"I have to prove something. Every time I'm the underdog, I like that because my killer instinct, my focus is there. This is what I want," Pacquiao said.
"We're not working one strategy, but we have two or three. If he wants to fight me, that's good for me.
"But if he's running and running and moving around the ring, we've prepared for that.
"I always trust the commission and the judges because our focus is not just on the knockout, but throwing a lot of punches in case it goes the distance."
Earlier, a crowd of around 1,500 turned out at the Mandalay Bay Hotel to watch Pacquiao speak publicly for the first time as the countdown to the richest fight in history - worth a staggering £330million - continued.
A noisy and colourful warm-up ceremony complete with a Filipino dancing band, singers and DJ filled the time until his appearance on stage 44 minutes late with trainer Freddie Roach and promoter Bob Arum in attendance.
"I'm feeling excited and confident. Are you nervous? Don't worry, I'm the one who will be in the ring," Pacquiao told the fans.
"I want to win. That's my goal."