Julio Cesar Chavez Jr didn't struggle to make weight this time, it seems, as the WBC middleweight titlist weighed in at 158 pounds to Sergio Martinez's 159 this evening in Las Vegas. The two fight tomorrow on HBO pay-per-view.

[ Full Coverage: Chavez Jr vs Martinez ]

Chavez (46-0-1, 32 KO) has admitted to badly struggling with making the 160-pound limit in the past, most recently for his February fight with Marco Antonio Rubio where he says he had to drop 13 pounds in the final 24 hours before the fight. Chavez's 158-pound weigh-in today is his lowest since 2009, when he was still trying to campaign at 154 pounds.

[ Showtime Weights: Canelo 154, Lopez 153 ]

That could be a bad thing, I suppose, if you think perhaps he overtrained and came in thinner than might be beneficial, but we'll see tomorrow with that. Martinez (49-2-2, 28 KO) looked as robust as ever, and never has trouble making weight.

Both fighters got in the other's face after they'd weighed in, with no shoving or physical contact (their noses may have touched), but some very intense trash talk. Sergio in particular looked as hyped up as you're probably ever going to see him, egging on both cheering Argentine fans (they were a surprising amount in the building) and the booing Mexican fans (whose strong presence was no surprise whatsoever).

Comparatively, Chavez was pretty calm. He was asked by Kellerman what he said to Martinez, and he replied, "I just said I'm going to beat him tomorrow." When asked what Sergio said to him, Chavez chuckled, and said, "He said he's going to tear my head off."

Martinez told Kellerman, "Tomorrow's going to be a war, because I want a war. ... It feeds me knowing that I'm going to punish him."

Top Rank promoter Bob Arum spoke with Jaime Motta, as well, and remarked on the atmosphere around the fight. "This is the kind of emotion we see in international football, even more pronounced because the hopes rest with two individuals."

Our coverage of Chavez Jr vs Martinez will continue this evening, and we'll have live round-by-round coverage tomorrow starting at 9 pm EDT.

Undercard Weights

WBA Super Bantamweight Title: Guillermo Rigondeaux 122 vs Robert Marroquin 122

WBO Super Featherweight Title: Roman Martinez 129 vs Miguel Beltran Jr 131

Beltran Jr is a full pound over the weight limit.

Middleweights: Matthew Macklin 160½ vs Joachim Alcine 158

Macklin is a half pound over the middleweight limit here, but probably no issue.

Light Heavyweights: Mike Lee 174, Paul Harness 173¼