keith kizer

Undefeated middleweight prospect J'Leon Love and super middleweight Matthew Garretson tested positive for banned diuretics following their fights on the May 4 undercard of the Floyd Mayweather-Robert Guerrero fight.

"I really felt like there was a death...I knew that I had made a horrible call in the 11th round," Nevada referee Russell Mora told RingTV.com of his failure to penalize Abner Mares for clear low blows in the first Joseph Agbeko fight.

Mark E. Ortega gathered news, notes and quotes from Antonio Tarver and James Kirkland, among others, during the Fox Sports Net boxing card that took place the night before the Floyd Mayweather-Robert Guerrero event in Las Vegas.

Floyd Mayweather Jr. looks to be in prime shape for Saturday's clash with Robert Guerrero, who says he can't wait "to get down."

Should Floyd Mayweather Jr. get beyond a May 4 date with Robert Guerrero at the MGM Grand, he could return to that site on Sept. 14 and go head-to-head with a potential clash between Tim Bradley and Juan Manuel Marquez.

Showtime's one-hour documentary 30 days in May gives a glimpse of Floyd Mayweather's 87-day jail stay in the Clark County Detention Center last year in advance of his May 4 showdown with Robert Guerrero. The show airs tonight at 10:00 p.m. ET/PT.

Top Rank CEO Bob Arum would like to "mix-and-match" Brandon Rios, Manny Pacquiao, Juan Manuel Marquez and Tim Bradley over the course of the next few months.

Bob Arum: "If the Nevada Commission has one standard of punishment for Americans, and one standard of punishment for Mexicans, then they should say that."

The Nevada State Athletic Commission on Wednesday voted 3-2 to suspend and fine lightweight prospect Mickey Bey, of Cleveland, for having tested positive for high levels of testosterone.

Unbeaten featherweight prospect Gary Russell Jr. claims he has been pursued by promoter Curtis Jackson, who is also known as the rapper 50 Cent. Russell is managed by Al Haymon and has a working relationship with Golden Boy Promotions.

Former WBC middleweight beltholder Julio Cesar Chavez Jr. can resume his fighting career after June 15, in accordance with a nine-month suspension handed down on Thursday by the Nevada State Athletic Commission as a result of his positive drug test for marijuana use.

Unbeaten lightweight prospect Mickey Bey has tested positive for high levels of testosterone following his third-round knockout of Robert Rodriguez on Feb. 2 in Las Vegas, Nev.

The United States Anti-Doping Association has handed down a decision regarding Erik Morales' punishment for testing positive before his rematch with Danny Garcia, but longtime boxing attorney Pat English called USADA's proposed ban "meaningless."

Julio Cesar Chavez Jr.'s case regarding his positive drug test for marijuana metabolites following September's loss to Sergio Martinez will be heard on Feb. 28, according to Nevada State Athletic Commission executive director Keith Kizer.  

Attorneys for Julio Cesar Chavez have requested a maximum six-month suspension and a $10,000 fine as a penalty for his positive drug test for marijuana following September's loss to Sergio Martinez. Chavez can be suspended for up to a year and fined the entire amount of his $3 million purse, or a combination of both.

Julio Cesar Chavez's positive post-fight drug test case will be reviewed in February; Plus, a Paul Williams update and a look at 6-foot-5 junior middleweight prospect Alantez Fox.

Attorneys for former WBC middleweight titleholder Julio Cesar Chavez Jr. will address his positive post-fight drug test for marijuana as well as his future before the Nevada State Athletic Commission on Tuesday. 

A Getty Images spokesperson says they are not necessarily asking for Manny Pacquiao's suspension in the wake of an alleged assault by members of the fighter's team on photographer Al Bello following Pacquiao's loss to Juan Manuel Marquez.

Following an alleged assault by Pacquiao advisor Michael Koncz and assistant trainer Restituto "Buboy" Fernandez on photographer Al Bello in the post-fight aftermath on Dec. 8, Getty Images is requesting that the NSAC take action.

The post-fight drug tests for Juan Manuel Marquez and Manny Pacquiao returned negative for anabolic steroids, masking agents and marijuana, according to Keith Kizer, executive director of the Nevada State Athletic Commission.

Does Juan Manuel Marquez rank with Julio Cesar Chavez Sr. among Mexico's all-time greats?

Floyd Mayweather Jr. plans to fight twice in 2013 against opponents to be determined on May 4 and Sept. 14, the two Mexican holiday weekends. 

Rapper 50 Cent was granted a promoter's license by the Nevada State Athletic Commission, although Floyd Mayweather Jr. is apparently no longer considered a partner in the company.

RING middleweight champion Sergio Martinez is recovering from knee surgery with an eye toward fighting on April 27 in his native Argentina.  

Sergio Martinez had surgery to repair torn ligaments in his right knee. THE RING middleweight champ wants to make a defense of his belts on April 27 and then face Julio Cesar Chavez in a rematch on Sept. 14.

Rapper 50 Cent to Floyd Mayweather Jr. on Twitter: "You should have know not to go against me PUNK."

50 Cent has apparently split from Floyd Mayweather and moved ahead with two fighters he signed: Billy Dib, who may defend his featherweight belt under Cotto-Trout, and Yuriorkis Gamboa, who fights on the Pacquiao-Marquez IV undercard.

Rapper 50 Cent has turned in an application for "SMS Promotions" to the Nevada State Athletic Commission -- and Floyd Mayweather's name isn't mentioned.

The Nevada State Athletic Commission executive director officially acknowledged Julio Cesar Chavez's positive drug test for marijuana on Friday.

Junior middleweight Saul "Canelo" Alvarez's fifth-round knockout of Josesito Lopez on Saturday drew a live gate of $1,618,150, according to Nevada State Athletic Commission executive director, Keith Kizer.

Sergio Martinez's unanimous decision over Julio Cesar Chavez on Saturday drew a live gate of $3,052,475, according to Nevada State Athletic Commission executive director, Keith Kizer.

WBC beltholder Julio Cesar Chavez weighed in at 158 pounds, his lightest in eight appearances as a middleweight, for Saturday night's defense against RING champion Sergio Martinez.

Rapper 50 Cent has officially applied for a promoter's license in Nevada.

Manny Pacquiao is apparently no closer to deciding from among at least two dates or among three opponents for his return to the ring. 

Lamont Peterson will be allowed to retain the IBF junior welterweight belt he won from Amir Khan last December, but he must make his first defense against former titleholder Zab Judah.

Super middleweight contender Andre Dirrell anticipates being back in action in November under TMT Promotions, the company formed by Floyd Mayweather Jr. and rapper 50 Cent.

Rapper 50 Cent is licensed to promote boxing shows in New York, but not yet in Nevada, where he has applied for a license and plans to eventually promote boxing events under The Money Team banner.

In his first public interview about his new venture with Floyd Mayweather, rapper 50 Cent announces that he has signed Australia's IBF featherweight titleholder Billy Dib to a promotional contract with TMT Promotions.

Andre Dirrell: "As 50 Cent and Floyd Mayweather boost my career, I can boost theirs as well, and we can make a big name for The Money Team."

The random tests of urine samples taken from middleweights Sergio Martinez and Julio Cesar Chavez Jr. on July 11 have returned negative in advance of their HBO-televised clash on Sept. 15. 

On Friday, the IBF could render a decision whether or not to strip Lamont Peterson of the belt he won from Amir Khan in the wake of Peterson's positive drug test in March.

The results of random urine test samples taken from Julio Cesar Chavez Jr. and Sergio Martinez on July 11 are expected sometime this week or early next week, according to Nevada State Athletic Commission executive director Keith Kizer. 

Lamont Peterson's camp says that his medical records will clear his name in the wake of his positive drug tests, and that his status as the WBA's "champion in recess" allows room for the fighter to contend for the organization's belt.

Amir Khan has been re-instated as the WBA's junior welterweight titleholder heading into Saturday night's clash with WBC beltholder Danny Garcia.

An investigation by the Nevada attorney general has determined that there was no criminal activity involved in Tim Bradley's split-decision victory over Manny Pacquiao on June 9.

In the wake of the Tim Bradley-Manny Pacquiao fight controversy, HBO's Harold Lederman says boxing should employ the best judges for the biggest fights, no matter what.

HBO commentator Jim Lampley calls Duane Ford, one of two referees who had Tim Bradley defeating Manny Pacquiao, "a standup guy." Ford will be a guest on Lampley's Fight Game, which airs Saturday night.

Tim Bradley's split-decision victory over Manny Pacquiao to take the WBO welterweight belt generated nearly $9 million at the gate.