That's according to boxing commentator Max Kellerman, who was asked if Pacquiao was a better pound-for-pound boxer than Mayweather.
The 47-year-old American, who is co-host of ESPN talk show First Take, put forward his argument for Pacquiao being the better pound-for-pound boxer.
However, Kellerman added that boxing legend Mayweather would beat his fierce rival even if they both fought in their respective primes.
"You can make the argument -- and I do -- that he's pound for pound better than Floyd Mayweather," he said on ESPN.
"Yes, Mayweather beat him, and yes, if they fought in their primes, I think Floyd Mayweather would have beaten him.
"But Floyd turned pro at 130. He won his first title at 130 -- at junior lightweight.
"Pacquiao is a naturally smaller guy. He won his first title, the lineal flyweight championship, at 112. Moving up from other divisions along the way [and] eventually moving up to junior middleweight.
"If you consider the body of work and where Manny started from, Pacquiao can be considered a better pound for pound -- which really means division for division -- fighter than Floyd Mayweather."
Mayweather, who retired from boxing in 2017 with an undefeated 50-0 record, faced Pacquiao in a blockbuster fight in 2015.
And the 43-year-old American walked away with the ultimate bragging rights after winning by unanimous decision in Las Vegas.
Mayweather and Pacquiao, who are two of the best pound-for-pound boxers of all time, have not let their rivalry settle since their 2015 mega-fight.
Pacquiao, 41, called out his fierce rival in a bizarre social media post in 2019 as he said he is 'ready' to face him 'any time, any place.'
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