Manny Pacquiao has claimed Guillermo Rigondeaux ran away from John Riel Casimero just like Floyd Mayweather 'didn't want to fight' him in May 2015. 

The Filipino superstar is due to fight short-notice replacement Yordenis Ugas on August 21 in his comeback fight, almost a week after his fellow countryman edged a razor-tight split decision against Rigondeaux in his most recent outing. 

Speaking to boxing reporter Elie Seckbach, Pacquiao explained his main takeaways from that bout, referencing the fact that Mayweather also had an extremely low output during their super-fight at the MGM Grand in Las Vegas. 

"Yeah I'm happy, I'm glad he retained his belt, but the thing is his opponent didn't want to fight him, it's like Manny Pacquiao and Mayweather," he told ESNews.

Former eight-time world champion Pacquiao, who thrust himself into the spotlight with his coming-of-age victory over all-time great Marco Antonio Barrera, looked set for a hotly-anticipated clash with WBC and IBF champion Errol Spence Jr this summer.  

But the bout was cancelled after the American fighter was forced to withdraw due to an eye injury. 

The Ultimate Manny Pacquiao Quiz: How well do you know the boxing legend?

Pacquiao, 42, still hopes to fight Spence Jr at some point but is keen to take things 'one at a time' given the Filipino senator is now preparing for Ugas and says he needs to focus on the underrated Cuban.

"He's good, I cannot underestimate him, it's going to be a good fight. I'm looking forward to fighting him," he added.

"I don't have a prediction but I will do my best to keep my fans satisfied with the fight.

"One at a time, anybody I can fight, if it can happen, it can happen."

Read more: Manny Pacquiao vs Yordenis Ugas: Date, Venue, Tickets, Live Stream, Odds, Stats And Everything You Need To Know

Manny Pacquiao deep in conversation with Freddie Roach

Manny Pacquiao deep in conversation with Freddie Roach

Pacquiao also spoke of his admiration for Saul 'Canelo' Alvarez after watching the Mexican superstar blast out Billy Joe Saunders

Canelo Alvarez currently occupies the No. 1 spot on GIVEMESPORT's pound-for-pound rankings. 

"Continue your career, he's good, I always watch his fights, he's very good," he added.

Read more: Manny Pacquiao retirement: Pac Man drops HUGE hint ahead of Yordenis Ugas showdown