A recap of the highest-profile boxing matches of the weekend.

Lucas Matthysse has huge power in both hands, although it was the left hook that took down Lamont Peterson. (Getty Images)

A Star Emerges

Lamont Peterson entered Saturday night's bout with Lucas Matthysse regarded by many as the finest 140-pounder in the world.

He left in a heap.

What was expected to be a highly competitive bout turned into a showcase for Matthysse. The Argentinean might just be the best pound-for-pound puncher in the world and emerged as an intriguing opponent for Floyd Mayweather Jr. with the performance.

Matthysse (34-2, 32 KOs) knocked down Peterson twice in the third round with a pair of left hooks before referee Steve Smoger stopped the fight at the 2:14 mark.

Peterson, who came in one pound above the junior welterweight limit, had the right idea in the first round by boxing, using his feet and staying away from Matthysse. Peterson (31-2-1, 16 KOs) then elected to be a bit more stationary and jab in the second round before being knocked down with a looping left hook that completely changed the fight.

The problem for Matthysse?

(Warning: Video contains strong language so viewer discretion is advised.)

LAS VEGAS -- It was hardly the classiest tactic, but trainer Ruben Guerrero injected plenty of intrigue into his son Robert's upcoming welterweight title bout with Floyd Mayweather Jr. on Wednesday.

After a boring thank-you fest disguised as a news conference in the MGM Grand's Hollywood Theatre, promoter Oscar De La Hoya invited Ruben Guerrero to the dais to say a few words. Virtually every other speaker had gone on in a monotone fashion, thanking every entity possible, name-dropping sponsors ad nauseum and predicting a great fight.

Ruben Guerrero (R) calls Floyd Mayweather Jr. "a woman beater" as Robert Guerrero looks on (AP)Ruben Guerrero, who has been trying to steal the spotlight from his son by, among other things, challenging Mayweather's father to a fight, changed things quickly.

He ranted and raved like a madman, shouting about Mayweather's domestic violence conviction that forced the pound-for-pound top boxer to spend 57 days in a local jail last year.

He started slowly, alluding to his challenge to

Floyd Mayweather Jr. may fight again on Sept. 14 (Las Vegas News Bureau via AP)Two short emails released to the media Tuesday by Keith Kizer, the executive director of the Nevada Athletic Commission, seemed to ignite yet another dispute between powerhouse promoters Top Rank and Golden Boy.

On Tuesday, Top Rank formally requested the date of Sept. 14 for a pay-per-view fight at the Thomas & Mack Center in Las Vegas between Juan Manuel Marquez and Timothy Bradley. As soon as that was released, though, Golden Boy CEO Richard Schaefer said his plan was to have Floyd Mayweather Jr. fight on that date at the MGM Grand Garden.

Both promoters, as well as the casinos, covet the Mexican Independence Day weekend date.

Mayweather is boxing's biggest star, and if he chose to fight, the Las Vegas casino industry as well as the cable and satellite operators, would likely side with him over any other fight. Mayweather does big business.

Timothy Bradley rallied from a knockdown to defeat Ruslan Provodnikov on March 16 (AP)Don't, though, expect there to be two major events in the city as there were in 2012. Las year on Sept. 15, Top Rank put on a pay-per-view show