Pacquiao, however, insists his speed will confront the 38-year-old pound-for-pound ruler with a challenge he has never faced before.

"I'm different to the 47 opponents he has fought before. I'm faster than them and I'm content for the fight.

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I believe this is the moment he will experience his first loss," said Pacquiao, who was speaking shortly after around 1,000 fans had gathered at the Mandalay Bay on Tuesday to watch a noisy and colourful event organised by the Filipino southpaw, who opted to host his own welcome to Las Vegas rather than join Mayweather at the official grand arrival at the MGM Grand.

Pacquiao enters the richest fight in boxing history as underdog for the first time since his eight-round destruction of Oscar De La Hoya in 2008, but he is happy for Mayweather to be backed.

Killer instinct
"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 too."