They arrived, the peed and they tested clean.

The results of the urine tests for WBC welterweight titleholder Victor Ortiz and unbeaten challenger Floyd Mayweather Jr. came back free of banned substances on Friday, said Nevada State Athletic Commission chairman Keith Kizer.

Ortiz (29-2-2, 22 KOs) and Mayweather (41-0, 25 KOs) will meet on Sept. 17 at the MGM Grand in Las Vegas on pay-per-view television.

Kizer said boxers routinely have their urine tested a month before their fights by the NSAC, with results usually being returned a week later.

"The entire process takes about a week," said Kizer, whose organization tests for steroids, masking agents and illegal drugs. "They went and had their urine taken last Thursday, and then the results came back today, and both guys passed."

Fighters also receive a pre-fight and a post-fight test on the night of the fight, said Kizer.

"Usually a month or so out from the fight, I call up the lab and I say that I'm going to send these two fighters for testing. I give them their names, I give them their birth dates and then I call the fighters and their representatives," said Kizer.

"Then I say, 'here's the toll free number. You need to call the lab today, and you need to tell them the zip code where the fighter is, and they will find you a place to go ASAP. And then, of course, you can urinate.'"

Kizer pointed out that Friday's results were not part of the more-frequent urine and blood testing that has been contractually mandated by Mayweather. That testing is being randomly conducted by the United States Anti-Doping Agency.

"Today's was the commission test. It was the official test before the fight," said Kizer. "The fact that they're doing some additional testing on their own, well, they're free to do that."

Mayweather and Shane Mosley underwent similarly random testing by the USADA prior to Mayweather's unanimous-decision victory in May.

Ortiz's manager, Rolando Arrellano, said the testing has made no difference to his fighter.

"We've been doing it for about six weeks. It's part of the terms and the conditions of the contract, and we've been testing with urine, we've been testing with blood, and they've all been clean because Victor's not on anything," said Arrellano.

"They just show up. But you know, it's just another day in camp and another day at the office. We're providing what they're asking, and it's no problem because we're not doing anything illegal. We don't care what Floyd wants us to do, because we're going to beat him any way."

Lem Satterfield can be reached at [email protected]