The father and trainer of Floyd Mayweather Jr. insists that his son will fight Manny Pacquiao in a long-awaited mega-fight he considers to be in demand as much as that between heavyweight greats Muhammad Ali and Joe Frazier.

“It’s gonna happen. That fight’s gonna happen. Trust me. That fight’s definitely gonna happen. It’s a fight for the world, man, right there,” said Floyd Mayweather Sr. during a recent interview on Fighthype.com.

“It’s the biggest fight that has ever been in life, so, like I said man, that fight’s gonna happen. I’ma tell you right now; [Floyd Jr.] never told me the fight’s gonna happen but I’ma tell you, the fight’s gonna happen. You mark my words and we’ll see. And it needs to happen.”

THE RING’s No. 1-rated fighter, pound-for-pound, as well as THE RING champion at welterweight and junior middleweight, Mayweather (47-0, 26 knockouts) is coming off last month’s unanimous decision victory over Marcos Maidana in a rematch of Mayweather’s majority decision victory in May.

In his last fight in April, Pacquiao (56-5-2, 38 KOs) dethroned Tim Bradley by unanimous decision, regaining the WBO welterweight belt he lost by disputed split decision to Bradley in June 2012. Pacquiao has also been knocked out by Juan Manuel Marquez, against whom he is 2-1-1. Mayweather owns a unanimous decision victory over Marquez.

Pacquiao will be back in action on Nov. 22 in Macao, China, defending his title against rising WBO junior welterweight titleholder Chris Algieri. Mayweather plans to return to action in May but left open the possibility that he could face Pacquiao in the future.

“I’m going to go back and talk to my team and see what we can assess and my next opponent. If the Manny Pacquiao fight presents itself, let’s make it happen,” said Mayweather after defeating Maidana. “Manny Pacquiao needs to focus on the task in front of him [fighting Algieri.] After he gets past that guy, we’ll see what the future holds.”

Now Floyd Sr. has joined the legion of boxing fans and observers who want to see Mayweather-Pacquiao.

“Just like [Muhammad] Ali and Joe Frazier, or Ali and George Foreman, something like that, man,” said Mayweather Sr. “It’s one of those fights like that.”

Even before Mayweather had vanquished Maidana, former undisputed heavyweight champion Lennox Lewis had called for networks Showtime, which has Mayweather, and HBO, which has Pacquiao, to make the fight. Ali also called for Pacquiao to face Mayweather in the wake of Mayweather’s initial triumph over Maidana.

In April, Lewis called for Showtime, Mayweather, HBO and Pacquiao to get together and make the mega-fight happen.

Weighing in on his Twitter account, Lewis compared the Mayweather-Pacquiao situation to the network rift that kept fans from seeing a showdown with Mike Tyson but was eventually resolved, paving the way for his eighth round knockout victory in June 2002. Lewis and Tyson were affiliated with HBO and Showtime, respectively, at the time.

“There was all the same political BS going on when I wanted to fight @MikeTyson I said make it happen and HBO & Showtime did,” stated Lewis. “If HBO and Showtime can get together for #LewisTysonIsOn and make the biggest fight in history at that time, MayPac can also happen.”

Lewis addressed Mayweather again on his Twitter after the victory over Maidana.

“I had Floyd winning fight, but thought it was close,” wrote Lewis on his Twitter account. “If I go back and re-watch, that might change. Was just a spectator last nite enjoying.”

Ali has also made a formal request for Mayweather-Pacquiao on his Twitter account.

“Congratulations @FloydMayweather,” read the tweet from Ali. “Maybe after you rest up we can see you rumble with @MannyPacquiao! #AliTweet”

If the fight happens, Mayweather will dominate Pacquiao, Floyd Sr. said.

“The world wants to see it and they’ll want to see it again when Floyd beats Pacquiao,” said Floyd Mayweather Sr. “I’m pretty sure Floyd is gonna make it look where people are going to want to see it again because I’m just saying, Floyd’s gonna pick Pacquiao apart, man.”