The undefeated American (40-0, 25 KOs) is set to meet the Filipino (50-3, 38 KOs) next year, with a March 13 welterweight clash on the cards subject to the fighters finalising contracts.
Mayweather, 32, made his bold prediction while appearing on HBO Television's Joe Buck Live on Tuesday night.
"Pacquiao's a good fighter but I've been around the sport a long time and I've dominated boxing for around 15 years now. No-one has defeated me yet so we'll have to see," he said.
"The thing is, I don't want the fans to be really shocked by what will happen when we do happen to meet up because it's not going to be anything new - he's been knocked out before and he's taken losses.
"I'll be victorious, you can believe it."
Mayweather, 32, made his bold prediction while appearing on HBO Television's Joe Buck Live on Tuesday night.
"Pacquiao's a good fighter but I've been around the sport a long time and I've dominated boxing for around 15 years now. No-one has defeated me yet so we'll have to see," he said.
"The thing is, I don't want the fans to be really shocked by what will happen when we do happen to meet up because it's not going to be anything new - he's been knocked out before and he's taken losses.
"I'll be victorious, you can believe it."
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