Mayweather, Pacquiao hurdle drug tests

Manny Pacquiao, from the Philippines, left, and Floyd Mayweather Jr., embrace in the ring at the finish of their welterweight title fight on Saturday, May 2, 2015 in Las Vegas. AP Photo/Isaac Brekken

MANILA, Philippines - Floyd Mayweather Jr. and Manny Pacquiao passed all drug tests they underwent before and after their May 3 fight at the MGM Grand Garden Arena in Las Vegas.

Yahoo! Sports' Kevin Iole said both fighters were each tested 19 times for illegal substances, and the results were all negative.

"According to records provided by the Nevada Athletic Commisison, each man gave 11 urine and eight blood samples. Among the special analyses given to the samples were Carbon Isotope Ratio Mass Spectrometry (CIR/IRMS) testing as well as tests to detect usage of EPO and human growth hormone," Iole wrote.

Mayweather and Pacquiao gave urine and blood samples to the United States Anti-Doping Agency, which handled the drug testing.

According to Iole, Mayweather submitted urine samples on March 13, 18, 19 and 28, April 2, 10, 15, 21 and 27 and May 1 and 2; and blood samples on March 13, 18 and 28, April 2, 10, 15 and 21 and May 2.

Pacquiao, for his part, gave urine on March 14, 17, 23 and 24, April 1, 9, 16, 22 and 27 and May 1 and 2; and blood samples on March 14, 17 and 24, April 1, 9, 16 and 22 and May 2.

Mayweather outpointed Pacquiao in that fight, which ended up as the richest ever in boxing history after selling a record 4.4 million pay-per-view units and raking in at least $400 million in revenue.

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