( CNN ) -- The proposed super-fight between Manny Pacquiao and Floyd Mayweather Jnr has been thrown into doubt because of a dispute over the timing of a pre-match blood-test according to Golden Boy Promotions . Richard Schaefer , chief executive of Golden Boy who promote Mayweather , announced on the company 's official Web site that the Filipino would not agree to blood-testing in the immediate run up to the welterweight fight which had been expected to take place in March . Mayweather 's management have requested the fighters submit to Olympic-style blood testing as outlined and mandated by the United States Anti Doping Agency ( USADA ) 30 days prior to the bout . But Schaefer claims that Pacquiao has refused to have blood taken so close to a fight with the American . `` Pacquiao would only agree to have blood drawn before the kick-off press conference and after the fight . It is unfortunate to hear this from Manny Pacquiao 's representatives , particularly since both parties had worked out all other issues related to this fight , '' Schaefer said on the Golden Boy Promotions Web site . Mayweather , who was informed of Pacquiao 's reluctance shortly after Schaefer received word of the impasse , empathized with his possible opponent but hopes he will undergo the tests . `` I understand Pacquiao not liking having his blood taken , because frankly I do n't know anyone who really does , '' Mayweather said . `` I hope this is either some miscommunication or that Manny will change his mind and step up and allow these tests , which were good enough for all these other great athletes , to be performed by USADA . '' USA Today reported an angry response from Pacquiao 's promoter Bob Arum of Top Rank , who said the fight was now in jeopardy . `` The press release is absurd , the plug [ on the fight ] is pulled . The fight is off as far as we 're concerned , '' he said . Arum , who has previously represented Mayweather added : `` It proves Mayweather is a coward and he 's looking for a way out of the fight . `` The Nevada commission has been doing drug testing for the last 40 years . To appease Mayweather , we agreed they could do urine analysis anytime they wanted . But Manny does n't want them to draw his blood when he 's in training because it weakens him , '' he told the American newspaper . Pacquiao became a five-weight world champion following his WBO welterweight title win over Miguel Cotto in November , while Mayweather returned from a 21-month retirement to beat Mexican Juan Manuel Marquez in September . Their super-fight was widely reported to be set for the MGM Grand in Las Vegas on March 13 , with only the final details to be thrashed out and an official announcement early next month .
The Manny Pacquiao and Floyd Mayweather fight is in doubt over the timing of a pre-match blood test . Golden Boy Promotions chief executive Richard Schaefer claims Filipino Pacquiao is refusing a test 30 days before the bout . 12/30/2009 02:02 PM By Michael Liedtke, Associated Press Writer Pacquiao 's promoter Bob Arum says the `` plug has been pulled '' on the fight .