Floyd Mayweather-Manny Pacquiao Boxing Fight of the Century: Tale of the Tape

What stats and a common opponent say about the opponents.

Mayweather may earn $180 million or more while Pacquiao's side will likely earn about $120 million, the Associated Press estimated.

Mayweather, the highest-paid athlete in the world, according to Forbes, grew up in a boxing family.

His father and trainer, Floyd Mayweather Sr., fought and lost to the legendary boxing champ Sugar Ray Leonard in 1978.

One opponent of both Mayweather and Pacquiao, Oscar De La Hoya, described his struggle to predict a winner.

"My head goes with Mayweather, my heart is with Pacquiao," De La Hoya told ESPN. "I like Pacquiao. I like what he stands for, what he believes in. I like his fighting spirit. I respect the boxer [Mayweather] but I love the fighter [Pacquiao].

"We know what Mayweather is going to do," De La Hoya said. "He doesn't change his game plan. There's nothing new to his style. With Pacquiao, there is so much room for improvement that he might surprise us."

Floyd Mayweather, Jr.

Nickname: Money

Age: 38

Children: 4

Trainer: Floyd Mayweather, Sr.

Born: Grand Rapids, Michigan

Height: 5 feet 8 inches

Reach: 72 inches

Record: 47 fights, 47 wins, 26 KOs

Emmanuel Dapidran Pacquiao

Nickname: Manny, Pac Man

Age: 36

Children: 5

Trainer: Freddie Roach

Born: General Santos City, Philippines

Height: 5 feet 6 1/2 inches

Reach: 67 inches

Record: 64 fights, 57 wins, 38 KOs