Manny Pacquiao

RING and WBO junior featherweight champion Nonito Donaire weighed in at 121.5 compared to the division limit of 122 for challenger Jorge Arce on Friday.

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.

HBO's exiting Larry Merchant: "I'm proud to be associated with so many talented people who made us into a groundbreaking network."

Thailand's former titleholder Poonsawat Kratingdaenggym is out of Saturday night's fight with WBA junior featherweight beltholder Guillermo Rigondeaux.

Fights involving multi-belt winners Floyd Mayweather, Bernard Hopkins and Shane Mosley are part of the plans of Golden Boy CEO Richard Schaefer for the year 2013. 

RING junior featherweight champion Nonito Donaire vows that "no way" will Saturday night's defense against Jorge Arce go the full 12 rounds.

Manny Pacquiao's advisor Michael Koncz called an incident with a photographer following Pacquiao's loss to Juan Manuel Marquez "a misunderstanding."

Manny Pacquiao went down swinging against rival Juan Manuel Marquez, a fact that his advisor, Michael Koncz, believes has endeared him to his fans even more.

IBF lightweight beltholder Miguel Vazquez: "I would like to fight Adrien Broner. That would be my choice, to fight Broner and face him and unify the titles. I want to prove myself against him."

Entering Saturday night's fight with Jorge Arce, Nonito Donaire said his Filipino fans are "in pain," many imploring him to "Do it for Manny," and "Lift our country back up again" in the wake of Manny Pacquiao's sixth-round knockout loss to Juan Manuel Marquez. 

Promoter Bob Arum on the notion from some members of the media that Juan Manuel Marquez-Manny Pacquiao IV would not do well: "That's why they're reporters and I'm a promoter."

IBF bantamweight titleholder Leo Santa Cruz aspires to the greatness of Mexican predecessors such as Julio Cesar Chavez Sr., Juan Manuel Marquez and Oscar Larios.

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

Manny Pacquiao's religious faith is helping the veteran former champ deal with the most devastating loss of his decorated career, his sixth-round knockout to Juan Manuel Marquez on Saturday.

Read on for all the fan feedback on Juan Manuel Marquez's shocking one-punch KO of Manny Pacquiao that can be contained in one mailbag. Enjoy!

Yuriorkis Gamboa and his promoter, 50 Cent, spoke to the media after Gamboa beat tough Michael Farenas on the Pacquiao-Marquez 4 undercard. 50 Cent, who spoke about Pacquiao-Mayweather, wants Adrien Broner for Gamboa.

Freddie Roach addressed the media after his star fighter, Manny Pacquiao, was knocked out by Juan Manuel Marquez. Roach spoke about Pacquiao's future and whether he would suggest retirement for the Filipino icon.

Referee Kenny Bayless on Juan Manuel Marquez-Manny Pacquiao IV: "When the bell rang for the first round, I could actually really see that it wasn't going to go the distance."

Manny Pacquiao got the firefight he wanted from Juan Manuel Marquez, only to get burned. 

THE RING editor Michael Rosenthal gives his thoughts on Juan Manuel Marquez's shocking sixth-round KO of arch-rival Manny Pacquiao from the MGM Grand in Las Vegas, the site of the future hall of famers fourth fight.

All the action from the fourth fight in this epic series, ending with Juan Manuel Marquez's sixth-round knockout of Manny Pacquiao.

Bouts from the undercard of Marquez-Pacquiao IV, featuring Yuriorkis Gamboa vs. Michael Farenas, Miguel Vazquez vs. Mercito Gesta and Javier Fortuna vs. Patrick Hyland.

Juan Manuel Marquez's shocking sixth-round knockout avenged his two losses and a draw to Manny Pacquiao in shocking fashion on Saturday at the MGM Grand in Las Vegas.

Yuriorkis Gamboa rose from a ninth-round knockdown after twice dropping Michael Farenas on the way to Saturday night's unanimous decision for the WBA's interim junior lightweight belt.

IBF lightweight beltholder Miguel Vazquez easily decisioned Mercito Gesta for his 12th straight win.

Featherweight Javier Fortuna unanimously decisioned Patrick Hyland for the WBA's interim belt on Saturday night's Manny Pacquiao-Juan Manuel Marquez card.

Mexican-American Olympian Jose Ramirez stopped his lightweight opponent in the first round of his professional debut on Saturday night's Manny Pacquiao-Juan Manuel Marquez undercard at the MGM Grand.

You can watch two bouts from the non-HBO Pay Per View portion of tonight's Manny Pacquiao-Juan Manuel Marquez IV event, plus the preview show, right here, starting at 4:00 p.m. PT/7:00 p.m. ET.

Trainer Eric Brown calls Manny Pacquiao-Juan Manuel Marquez "a pick-em fight."

Juan Manuel Marquez should "be more dynamic and explosive, and be able to perform more quickly" than he did in November against Manny Pacquiao, according to his strength and conditioning trainer.

The uncle and trainer of Floyd Mayweather said he would like for his next fight to be against Tim Bradley.

Photos from the scales a day ahead of the fourth (and final?) fight between Manny Pacquiao and Juan Manuel Marquez at the MGM Grand.

Saturday night's fourth bout between Manny Pacquiao and Juan Manuel Marquez has sold out at the MGM Garden Arena, producing a live gate of $10.5 million.

Juan Manuel's trainer, Nacho Beristain, rejected Manny Pacquiao's invitation to a toe-to-toe battle with Marquez, saying, "They can't and will not fight toe-to-toe, because that's not their styles."

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. 

Following Angel Hernandez's announced intention to consult his lawyers about a possible lawsuit against Freddie Roach over what he says were insinuations about Juan Manuel Marquez's use of PEDs, Roach called Hernandez "a rat" and "a piece of s__t."

Strength and conditioning guru Angel Hernandez claims that trainer Freddie Roach has accused Juan Manuel Marquez of having used performance enhancing drugs out of fear that his fighter will defeat Manny Pacquiao on Saturday night.

Manny Pacquiao says Juan Manuel Marquez can "prove something" by abandoning his counter-punching style and standing, "toe-to-toe," against him on Saturday night.

Rapper-turned-promoter 50 Cent envisions a clash between former featherweight titleholder Yuriorkis Gamboa and lightweight sensation Adrien Broner, and says he's the man who can make Mayweather-Pacquiao happen.

Juan Manuel Marquez doubts that he could "ever have a real, personal relationship" with Manny Pacquiao out of the ring, to which Pacquiao said "That's his problem."

WBO welterweight titleholder Tim Bradley could return to the ring on Feb. 9, and managerial and promotional stablemate Brandon Rios could get a shot at Manny Pacquiao on April 20.

Juan Manuel Marquez on speculation that he has taken PEDs: "I think that you can say anything that you want, but you don't have any proof, so what does that mean? It means nothing"

Brandon Rios: "I just want to prove everybody wrong and to show everybody that when I make my weight, and I'm where I'm supposed to be at, there's no stopping me."

Will Juan Manuel Marquez finally defeat Manny Pacquiao? Read on for the opinions of 27 boxing insiders.

Manny Pacquiao went a couple of rounds with ex-NBA stars Charles Barkley and Reggie Miller as part of a production called Charles and Reggie: Toe to Toe with Manny Pacquiao.

Trainer Virgil Hunter says Amir Khan's knockout losses are more about awareness than his having a fragile chin, and believes that Miguel Cotto erred by training at high altitude before facing Austin Trout..

Sugar Ray Leonard on Manny Pacquiao-Juan Manuel Marquez IV: "This fight here is the most defining moment for these two guys."

Manny Pacquiao will be featured on TNT on Thursday night as a result of visits from former NBA stars Charles Barkley and Reggie Miller.

Austin Trout wished his 88-year-old great grandmother, Dorothy Johnson, "Happy birthday 'Nanna' Johnson," after Saturday night's unanimous decision victory over Miguel Cottto.

Manny Pacquiao's one-hour workout will be streamed live from a screen that is seven stories tall in Times Square on Friday.