weigh-in

Floyd Mayweather Jr. and Robert Guerrero on the scales in Las Vegas, plus undercard bouts Daniel Ponce de Leon-Abner Mares and Leo Santa Cruz-Alexander Munoz.

Watch the live stream of the Floyd Mayweather-Robert Guerrero weigh-in today starting at 2:45 p.m. PT from the MGM Grand Garden Arena in Las Vegas, the site of their Showtime Pay Per View showdown on Saturday.

Photos from the scale as RING middleweight champ Sergio Martinez and challenger Martin Murray weighed in for Saturday's fight in Buenos Aires.

Photos from the weigh-in for the Danny Garcia-Zab Judah RING, WBC and WBA junior welterweight championship fight, and the Peter Quillin-Fernando Guerrero middleweight co-feature matchup.

Showtime Sports will offer a live stream of today’s weigh-in for THE RING junior middleweight championship between Saul “Canelo” Alvarez and Austin Trout taking place on Saturday, live on Showtime from Alamodome in San Antonio. The weigh-in begins at 3:00 p.m. ET / 2:00 p.m. CT / Noon PT from Market Square in San Antonio.

Nonito Donaire and Guillermo Rigondeaux on the scales for their RING, WBO & WBA junior featherweight title bout at New York's Radio City Music Hall.

Weigh-in photos for the April 8 card in Tokyo featuring Toshiyuki Igarashi-Akira Yaegashi, Shinsuke Yamanaka-Malcolm Tunacao, and Gamaliel Diaz-Takashi Miura.

Photos from the weigh-ins for Zou Shiming-Eleazar Valenzuela, Brian Viloria-Juan Francisco Estrada and Rocky Martinez-Diego Magdaleno at the Venetian Macau Resort.

An amped-up Brandon Rios and Mike Alvarado at the scales before their rematch this Saturday in Las Vegas. Photos by Naoki Fukuda.

Tim Bradley and Ruslan Provodnikov on the scale ahead of Saturday's matchup in Carson, Calif. Both fighters weighed in at 146.6 pounds.

Weigh-in pics for the March 2 Showtime card featuring lightweights Richard Abril vs. Sharif Bogere and featherweights Gary Russell Jr. vs. Vyacheslav Gusev.

Photos from the scales as Adrien Broner and Gavin Rees made weight (it's not clear if Broner's 134 pounds was before or after he downed that can of Sprite) for their fight this Saturday in Atlantic City.

Adrien Broner and Gavin Rees easily made weight for their WBC lightweight title bout on Saturday in Atlantic City. Broner weighed in at 134 pounds, while his challenger Rees tipped the scales at 134.5 during Friday's weigh-in.

Photos from the scales: Saturday's Showtime card featuring Lucas Matthysse-Mike Dallas Jr., Selcuk Aydin-Jesus Soto Karass, and Jermell Charlo-Harry Joe Yorgey.

See images from the weigh-in of the Boxing After Dark card featuring Orlando Salido-Mikey Garcia, Gennady Golovkin-Gabriel Rosado and Rocky Martinez-JC Burgos. Photos by Naoki Fukuda.

Photos from the weigh-in for the Jan. 11 edition of ShoBox, featuring featherweights Ronny Rios and Rico Ramos, and junior middleweights Daquan Arnett and Brandon Quarles.

It was chilly by Los Angeles standards, but the brave Corona girls were joined by Amir Khan, Carlos Molina, Alfredo Angulo, Deontay Wilder, Leo Santa Cruz and others fighting on Dec. 15 as they stepped up to the scales on Friday.

RING junior featherweight champ Nonito Donaire and all-action challenger Jorge Arce on the scales before Saturday's matchup in Houston.

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

Andre Berto and Robert Guerrero made weight for their HBO-televised welterweight showdown on Saturday in Ontario, Calif., as did Keith Thurman and Carlos Quintana for their junior middleweight co-feature. 

Former two-time welterweight titleholder Andre Berto weighed half a pound more than former featherweight beltholder Robert Guerrero at the Friday weigh-in for their HBO-televised fight tomorrow. Berto weighed 146.8. Guerrero weighed 146.4.

WBC 122-pound titleholder Abner Mares and his challenger Anselmo Moreno easily made weight on Friday at Staples Center in L.A., the site of their Showtime-televised showdown on Saturday. Mares weighed 121.8 pounds; Moreno weighed 120.8.

Junior featherweights Takalani Ndlovu and Alejandro Lopez checked in at 121 1/4 and 121 3/4 pounds, respectively, for their IBF eliminator bout in El Paso, Texas.

Photos from Tokyo of the weigh-in featuring WBC lightweight titleholder Takahiro Ao and challenger Gamaliel Diaz (who may or may not be related to David Duchovny) ahead of their fight on Saturday.

Brandon Rios made weight for Saturday's matchup with Mike Alvarado and everyone is relieved that the fight will proceed as planned, but what about that "elbow injury" back in July?

Photos of Nonito Donaire, Toshiaki Nishioka, Brandon Rios and Mike Alvarado on the scales ahead of Saturday's card at the Home Depot Center in Carson, Calif.

Showtime Sports presents a recap of the "Knockout Kings" weigh-in ceremony. Watch as headliners Saul "Canelo" Alvarez and Josesito Lopez hit the scales, then watch them fight on Saturday at 9 p.m. ET/6 p.m. PT on Showtime.

Watch Sergio Martinez and Julio Cesar Chavez Jr. weigh-in and engage in a heated and lively staredown in front of a racous crowd at the Thomas & Mack Center in Las Vegas, the site of their middleweight championship bout.

Pictures from Las Vegas as Julio Cesar Chavez Jr. and Sergio Martinez stepped on the scales and then got in each other's faces.

Photos from the weigh-in for the Sept. 15 card featuring Saul "Canelo" Alvarez, who weighed 154 pounds, vs. Josesito Lopez, who came in at 153.

Several boxing stars were on-hand to see Andre Ward, Chad Dawson, John Molina and Antonio DeMarco step onto the scale in downtown Oakland, Calif.

Junior welterweights Lucas Matthysse and Olusegun Ajose hit the scales for their Showtime-televised title matchup on Saturday.

Watch the live stream of the Andre Ward-Chad Dawson weigh-in today, starting at 2:30 p.m. PT/5:30p.m. ET, on RingTV.com. Nick Cannon hosts the event at the Oakland City Center in Oakland, site of tomorrow's HBO-televised RING super middleweight championship.

Undefeated lightweight Diego Magdaleno and Antonio Davis weighed in for Saturday's fight card, which also features junior welterweight Jose Benavidez and light heavyweight Mike Lee.

Robert Guerrero, whose fight with Selcuk Aydin on Saturday is his first above 140 pounds, made weight at Friday's weigh-in as expected but the former featherweight beltholder unexpectedly got into it with the undefeated welterweight contender.

Photos of Amir Khan and Danny Garcia at the weigh-in for their July 14 junior welterweight title unification bout in Las Vegas.

Junior middleweight combatants Cornelius Bundrage and Cory Spinks, Erislandy Lara and Freddy Hernandez, plus featherweights Gary Russell Jr. and Chris Perez on the scales for Saturday's card in Indio, Calif.

Hopefully getting all head butts out of the way early, Victor Ortiz and Josesito Lopez went face to face, then face on face, at the Hollywood weigh-in for their welterweight clash at Staples Center on Saturday.

A serene Manny Pacquiao faced a ripped-and-ready Tim Bradley at the weigh-in for Saturday's show in Las Vegas. Photos by Naoki Fukuda.

Floyd Mayweather Jr., Miguel Cotto, Shane Mosley and Saul "Canelo" Alvarez all took to the scales ahead of Saturday night's 'Ring Kings' event at the MGM Grand in Las Vegas.

Juan Manuel Marquez and Sergei Fedchenko hit the scales in Mexico City ahead of Saturday night's fight for the vacant WBO junior welterweight title.

Brandon Rios does it again at the weigh-in for his April 14 bout against Richard Abril, going over the lightweight limit by two full pounds and losing his chance to win a title for the second fight in a row.

Fighters for the Feb. 18th card in Corpus Christi, Texas, hit the scales, including junior middleweights Paul Williams and Nobuhiro Ishida, light heavyweights Tavoris Cloud and Gabriel Campillo, and heavyweights Chris Arreola and Dereck Chisora.

Super middleweight rivals Andre Ward and Carl Froch hit the scales ahead of their Dec. 17 fight for division supremacy.

Things got heated as Victor Ortiz and Floyd Mayweather hit the scales with only one day remaining until their clash at the MGM Grand in Las Vegas. Photos by Naoki Fukuda.