Manny Pacquaio is not afraid to fight Floyd Mayweather and has come up against his pound-for-pound rival's desperation to protect a flawless record in recent attempts to make boxing's most talked about potential showdown, according to trainer and long-time mentor Freddie Roach.

Fight fans have been left frustrated for more than three years by an impasse in negotiations between Pacquaio and Mayweather, with the most recent attempt to finally get boxing's two brightest stars of the modern era falling short thanks to the long-running feud that has set Golden Boy and Top Rank at opposite sides of the sport.

Both men are preparing to fight for the first time in 2014 over the next three weeks, against Timothy Bradley and Marcos Maidana respectively, but despite excitement building around Las Vegas for both clashes it's a meeting between the pair that boxing heads crave.

Pacquiao's trainer Roach is adamant that Mayweather is now focused on making his sure his unbeaten streak is preserved rather than fighting the best, with a prime window of opportunity to make the clash happen missed around two years ago.

Roach told the Daily Mail: "Down the years, no matter what the issues, if two fighters really want to fight each other they maks it happen. Manny will fight anyone but Floyd is two years older and thinking about that record of his.

"It would be great if Floyd and Manny met in what could be the last fight for both of them. But it looks like in the future people will look back and ask why these two never fought each other."

For now Pacquaio's attention will be firmly fixed on a rematch with Bradley at the MGM Grand in Las Vegas just over 24 hours from now, desperate to prove he's still relevant at the highest level of the sport.

The Filipino hero dismantled Brandon Rios in his comeback bout last November, but hasn't stopped an opponent since smashing Miguel Cotto in 2009, with questions about his power and desire likely to be answered definitively by Saturday night's showdown with unbeaten Bradley.

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