Julio Cesar Chavez Jr and Sergio Martinez will weigh in today in Las Vegas for tomorrow night's HBO pay-per-view main event at the Thomas & Mack Center, and we'll have the live streaming video today, starting at 6:30 pm EDT.

I'll be doing live updates on Twitter as the weights come in, but we'll also have pretty much immediate results posted here on the site, too.

[ Chavez Jr vs Martinez Preview: Big Fight Stories and Jenny Lewis ]

Martinez (49-2-2, 28 KO) and Chavez Jr (46-0-1, 32 KO) are set for one of the year's most highly-anticipated bouts, and what should be one of the biggest fights of the year. The building is sold out, the fight has real buzz, and it's a fight that fans have requested and actually received. Go figure -- when you give fans what they want, you have an organic big fight, rather than something that just has to be called a big fight.

The undercard fighters, of course, will also weigh in. Here's the four-fight PPV undercard lineup.

Super Bantamweights, 12 Rounds (WBA Title)
Guillermo Rigondeaux (10-0, 8 KO) vs Robert Marroquin (22-1, 15 KO)

Super Featherweights, 12 Rounds (WBO Title)
Roman Martinez (25-1-1, 16 KO) vs Miguel Beltran Jr (27-1, 17 KO)

Middleweights, 10 Rounds
Matthew Macklin (28-4, 19 KO) vs Joachim Alcine (33-2-1, 19 KO)

Light Heavyweights, 4 Rounds
Notre Dame "Mike Lee" Subway (10-0, 6 KO) vs Paul Harness (4-3-1, 3 KO)