Floyd Mayweather was in a wild mood on Tuesday (AP)LAS VEGAS -- Floyd Mayweather Jr. ranting about Manny Pacquiao, and particularly what he believes is Pacquiao's unusual climb up boxing weight classes, is nothing new.

But on Tuesday in front of a small group of reporters in the VIP check-in area at the MGM Grand, Mayweather put on quite a memorable show. He ended one of the most intriguing interviews he ever gave by concluding with a 15-minute tirade in which he said his health was too important to fight someone on performance-enhancing drugs.

He was giving the interview ostensibly to promote his pay-per-view bout Saturday at the MGM Grand Garden against Miguel Cotto for the World Boxing Association super welterweight championship. Mayweather, though, spoke much more about Pacquiao than he did about Cotto, even though he was never asked about Pacquiao until after he brought up Pacquiao himself.

Mayweather and Pacquiao are the top two fighters in the Yahoo! Sports rankings and are the two most popular men in the sport. They've

Lavarn Harvell (R) connects on Tony Pietrantonio (Tim Shaffer/Reuters)If you've ever wondered what it was like to get punched in the head — really hard — fortunately, you don't have to climb into the ring and find out yourself. Photographer Tim Shaffer gives you a pretty good idea of what it is like with his photo of Lavarn Harvell's knockout of Tony Pietrantonio in Atlantic City, N.J., on Saturday.

Fighting on the undercard of the HBO-televised Bernard Hopkins-Chad Dawson light heavyweight title fight, Harvell knocked out Pietrantonio in a bout that got scant attention.

It was scary at the time, though, because when Pietrantonio went down, he slammed his head violently against the mat. He landed right in front of press row and his head hitting the mat was easily audible to reporters in the first several rows.

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Immediately, officials signaled for a stretcher to be brought in, but Pietrantonio was fine and left the ring under his own power a few minutes later.

Shaffer's incredible photo caught the

Julio Cesar Chavez will defend his title in El Paso, Texas against Andy Lee (Chris Farina/Top Rank)

One of the more bizarre scenarios of recent times ended the way it should have on Friday when the chancellor of the University of Texas system reversed an earlier decision and now will allow Julio Cesar Chavez Jr. to defend the World Boxing Council middleweight title against Andy Lee on June 16 at the Sun Bowl in El Paso, Texas.

On Tuesday, minutes before a press conference to formally kick off the fight promotion, chancellor Francisco Gonzalez Cigarroa canceled the bout for security reasons. Promoter Bob Arum then suggested the cancellation was retribution for critical comments made by his son, Richard Arum, that were critical of the performance of students in the Texas system.

At a news conference on Thursday in El Paso, FBI El Paso Special Agent in Charge Mark Morgan said he knew of no reason the fight should not be permitted, saying there were n "know, credible or specific" security threats.

On Friday, Cigarroa reversed himself, though he put conditions on it. State, local and