MANILA, Philippines – Filipino boxing champion Manny Pacquiao is skeptical about Floyd Mayweather's decision to finally face him inside the ring.

Pacquiao said he will never believe Mayweather’s statement unless he sees a signed contract formalizing the controversial boxer’s intent to fight him.

“Gawin niya, hindi puro salita,” the fighting congressman said in Gerry Ramos’ report on Spin.ph .

“Pumirma siya.”

Mayweather earlier said in an interview with Showtime’s Steven Farhood that he’s ready to fight Pacquiao and even mentioned a May 2 fight date.

"We are ready. Let's make it happen. May 2. Mayweather versus Manny Pacquiao. Let's do it," he said.

Mayweather even called Pacquiao ''desperate.''

“He's in a very, very tight situation. He's lost to [Juan Manuel] Marquez [in 2012], he's lost to [Timothy] Bradley [by controversial decision in 2012 but avenged it in April]. Pay-per-view numbers are extremely low. He's desperate. I wanted that fight a long time ago," said the controversial American boxer.

However, Pacquiao has reasons to doubt his rival.

During their first round of talks in 2009, the negotiations were turning out fine until Mayweather came up with a condition requiring Pacquiao to undergo random urine and blood testing even up to the weigh in. Pacquiao initially turned down the demand and this led to the breakdown of the negotiations.

A year later, the American rang up Pacquiao and wanted the Filipino to agree on getting a $40 million flat fee for the super bout. Knowing that the fight will generate a lot more, the Filipino asked for a 45-55 split which was turned down by Mayweather.

Even Pacquiao’s longtime publicist Fred Sternburg doubted Mayweather’s latest statements.

Same old @FloydMayweather. He thinks everyone buys his junk. He might as well have been interviewed by the Nevada State Athletic Commission. — Fred Sternburg (@TooFred) December 13, 2014

Sternburg was alluding to the American boxer’s appearance before the Nevada State Athletic Commission claiming that some of the scenes that were shot for a Mayweather vs Maidana documentary were faked.