Pacquiao goes into Saturday's bout that has the boxing world buzzing trailing a mantle of humanitarian deeds.
The two-term congressman tipped as a future Philippines president has left womanizing and gambling ways behind him and while he stands to make some USD 100 million for his night's work on Saturday, the devout Christian says he hopes the intense focus on the fight will be a stage for the glorification of God.
But Mayweather won't be playing the devil, despite a history that includes two months in jail in 2012 for an assault on an ex-girlfriend in front of two of their children.
"I am a realist," said Mayweather, the 38-year-old American who has parlayed a perfect 47-0 ring record into a reign as the highest paid sportsman on the planet.
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"This fight is not good versus evil. It is one fighter who is at the top and another."
It was Pacquiao trainer Freddie Roach who first billed the fight as good against evil, citing Mayweather's record of domestic violence.
Mayweather, an energetic trash-talker in his younger days, has often courted controversy -- Comparing himself favorably to Muhammad Ali and flaunting the perks his wealth has brought: houses, cars, even an airplane.
But Mayweather, who said this week he expects a payday of USD 200 million for this fight alone, says none of that will matter when he steps in the ring.
"I believe in my skills. I believe I will be victorious," said Mayweather, who puts his World Boxing Council and World Boxing Association welterweight belts on the line against Pacquiao, the World Boxing Organization champ who boasts a record of 57-5-2.