Did Chavez Jr. hurry to escape urinalysis?

On Sunday afternoon, I busted Marco Antonio Rubio's chops for insinuating that Julio Cesar Chavez Jr. used an illegal PED or PEDs before his unanimous decision title-defense win in San Antonio Saturday night.

I stand by that piece, because Rubio made that implication in a Boxing Channel interview based on his feeling that Chavez was stronger than he thought he would be and had more stamina than the loser thought he should have. However ... it now emerges -- in stories that ran on Boxing Scene and Yahoo! -- that Chavez apparently didn't provide a customary post-bout urine sample, and Team Rubio claims that he fled the arena to avoid providing it. If Junior did in fact skip out, that info, combined with the fact that he tested positive for a banned diuretic following his November 2009 fight with Troy Rowland in Las Vegas, makes Rubio's sour grapes a bit less sour. There would be a track record at that point, and even though I maintain that a using a diuretic to aid weight loss isn't in the league of an EPO, Rubio's allegation becomes more understandable. However, as Twitter followers Ron Buckner and EdwinAA kindly noted, the diuretic furosemide is sometimes used by dopers as a masking agent to avoid detection of banned substances. So perhaps Junior wasn't just seeking a shortcut to make weight back in 2009.

We need to know the specific postfight circumstances. Did the Texas commission drop the ball in not having a rep with a cup handy in Chavez's dressing room? I texted Freddie Roach, Junior's trainer, to ask for clarification, and I'll share that if and when I hear back.

Sergio Martinez fans will certainly want this mystery cleared up. They want Junior to put his WBC middleweight crown on the line against Sergio after the latter takes care of his business on March 17 at the Madison Square Garden Theater, against Matthew Macklin, and they'd like assurances that the 25-year-old Junior is on a level playing field with Martinez, 36, if that fight comes to fruition. That's a big, fat "if" in the minds of many fans, who think Junior and his promoter, Bob Arum, would rather he battle ultra-faded Antonio Margarito than risk his title against a less-faded Martinez.