LAS VEGAS - Manny Pacquiao offered no extra hope to fans that he will fight Floyd Mayweather next year, but his trainer says the long-awaited showdown might be the only challenge left for the Filipino icon.

Pacquiao was greeted by hundreds of well-wishers on Tuesday as he arrived at Las Vegas for Saturday's fight against Mexico's Juan Manuel Marquez, but he was ho-hum about Mayweather's pitch last week for a May 5 fight with Pacquiao.

"What I've done, I'm happy (with)," Pacquiao said on Tuesday. "Whatever fight my promoter gives me I'll take it and fight hard.

"We haven't made a decision about the next opponent. After this fight, I'm just waiting for the next."

Unbeaten Mayweather, Pacquiao's main rival as the world's top pound-for-pound fighter, has not made a deal to fight the Asian southpaw even though such a bout could fetch $50million (about R395million) for each fighter if it ever happens.

"I think that fight has to happen," said Freddie Roach, Pacquiao's trainer. "It needs to happen because it's the only challenge out there (for Pacquiao). I don't see any other challengers."

Even so, Pacquiao's camp made it clear that Mayweather's hand-picking a date and site for his next fight and then offering to fight "Pac-Man" is unacceptable. "I'm kind of tired of Floyd," Roach said. "Shut up and fight or not. We'll fight him any day of the week. Who is he to make the rules?"