Former Las Vegas judge CJ Ross believes Floyd Mayweather Jr. will knock out Manny Pacquiao out in their upcoming fight on May 2 at MGM Grand Arena in Las Vegas, Nevada.

Ross said an interview with World Boxing News that both fighters are past their prime. But based on what she saw from the previous fights of both fighters, Ross is convinced that age affected Pacquiao more than it affected Mayweather over the past several years.

"I have observed and judged both fighters for most of their careers and have witnessed the effects of age on both," Ross said. "I've seen more of a decline in Manny Pacquiao than I have seen in Floyd Mayweather. Mayweather still has his punch speed, although he has lost some of his foot speed."

Mayweather, who will put his perfect 47-0 record on the line on Cinco de Mayo weekend, is not known for his punching power. In 47 wins, Mayweather has just 26 knockout victories with the last one coming against Victor Ortiz, who the unbeaten champion stopped in the fourth round of their welterweight title fight in November 2011.

Ross is convinced, though, that Mayweather will score a knockout against Pacquiao next month because he still has the strong desire to prove his doubters wrong, while Pacquiao's legs are already weak.

The former boxing judge said that Pacquiao could withstand the blows in the early rounds, but will eventually be stopped by the reigning pound-for-pound king within eight rounds.

"He has never been a knockout puncher, but he has enough desire to not go out as a loser," Ross said of Mayweather. "Pacquiao on the other hand has weaker legs, his timing is off and he has lost before. He has the heart though and might be able to hold out in the early rounds, but I don't see it going past the eighth."

When asked if she thinks there will be a rematch later this year, Ross, who announced her retirement after Mayweather's victory against Saul Alvarez in September 2013, sounded unsure if both fighters will take a risk again after already getting the biggest guaranteed purse of their respective careers.

"Knowing that both fighters receive the money they have agreed on whether they win or lose, will either one want to continue to get beat up for no advantage at the end of their careers?" Ross said.

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