THE MONUMENTAL FIGHT between Manny Pacquiao and Floyd Mayweather Jr. is still on. In the court room, at least.

Pacquiao will file a lawsuit against Mayweather ?as soon as possible? over insinuations by the undefeated American?s camp that the Filipino sensation is taking performance-enhancing substances.

?I have tried to just brush (allegations) off as a mere pre-fight ploy but I think they have gone overboard,? Pacquiao said in Filipino Friday in an interview with Philboxing.com in Sarangani province.

Pacquiao is expected to file libel, slander and defamation suits against Mayweather?s camp and Golden Boy Promotions, which handles the American?s interests for the fight.

Promoter Bob Arum on Thursday declared the megafight between his fighter Pacquiao and Mayweather Jr. dead, though efforts continued to find a compromise to a dispute over blood testing.

?It?s over,? Arum told the Associated Press. ?O-V-E-R.?

Arum set a Thursday deadline (Friday in Manila) for an agreement on testing, the only issue still hanging before the contract is finalized for the March 13 fight.

But with the Mayweather camp insisting on tapping the United States Anti-Doping Agency to conduct the tests, Arum said there wasn?t much left to discuss.

?They?re viewed by the Pacquiao side as being partisan,? Arum said in the same interview, referring to the USADA. ?He doesn?t want to use them. I don?t want to use them. They?re so inflexible they can?t be used.?

Pacquiao told Philboxing.com he already asked Arum to help him file the case ?as soon as possible because I have had people coming over to me asking if I really take performance-enhancing drugs and if I cheated my way into becoming the No. 1 boxer in the world.?

The reigning pound-for-pound king emphasized: ?I maintain and assure everyone that I have not used any form or kind of steroids and that my way to the top is a result of hard work.?

Pacquiao-Malignaggi March 13

Arum said he planned to move forward by having Pacquiao fight on March 13 against Paul Malignaggi, a flashy but light-hitting boxer. He said there is still a chance Pacquiao and Mayweather could meet later in the year.

?As far as I?m concerned the fight is over,? Arum said. ?Can it be revisited in the autumn? We?ll see.?

Mayweather?s representatives could not be immediately reached for comment, but Arum said an effort on Thursday by HBO Sports chief Ross Greenburg to reach a deal had failed.

There were still other talks going on between the two sides, but the odds of the fight happening on March 13 were dimming with each passing day.

?These people think they are doing the sport a great service?they are not,? said Pacquiao. ?To Floyd, despite all these accusations, may your Christmas be merry and I will see you in court, soon, too.?

At the core of the dispute is the insistence of the Mayweather camp to use Olympic-style drug testing for the fight, even though both fighters have never been linked to any performance-enhancing substances.

Under Nevada state regulations, boxers are generally tested only just before the fight and in the dressing room afterward, and only urine samples are given.

Mayweather?s camp wants blood tests that can find things urine tests can?t, such as the use of human growth hormone. They also want the tests done by USADA, from the time the fight contract is signed until the fight is held.

Pacquiao and his handlers have agreed to both urine and blood testing, but don?t agree to testing immediately before the fight. He believes giving blood so soon before a fight will weaken him.

The fight was expected to be the richest ever, with both fighters standing to earn between $30 million and $40 million, depending on television sales.