Julio Cesar Chavez Jr. looked calm and confident as he spoke to the press at Alamodome in San Antonio.

The undefeated Chavez promised a convincing victory over fellow Mexican Marco Antonio Rubio, the mandatory challenger for Chavez’s WBC middleweight title.

“I’m happy that the time has come to get in the ring,” Chavez said. “I know, just like Rubio, that this [was] my best training camp. I have a lot of experience and know exactly what to do [in the ring]. I’m going to have a great fight, and plan to entertain as well.

“The last time I fought here was an important fight that took me to the next level against John Duddy. San Antonio has a special place in my heart. This fight will leave no doubts that I am the top middleweight in the world. I want to thank God for giving me the strength. I trained very hard to give you guys the best possible fight and can’t wait to fight.”

Chavez conveniently neglected the fact that no matter how he does against Rubio, it won’t establish him as boxing’s best middleweight. That distinction belongs to Argentine southpaw Sergio Martinez (48-2-2, 27 KOs), whom the 25-year-old Chavez (44-0-1, 31 KOs) continues to avoid.

Nevertheless, the heavy-handed Rubio (53-5-1, 46 KOs) figures to provide a tough test for the fast-improving son of Mexican legend Julio Cesar Chavez.

Former middleweight champ Kelly Pavlik battered Rubio in Rubio’s last world championship match, but the 31-year-old Rubio has won 10 straight fights since that one-sided, nine-round TKO loss in February 2009. Rubio’s winning streak includes a seventh-round TKO defeat of previously unbeaten Canadian contender David Lemieux (25-2, 24 KOs) on April 8 in Montreal.

The Chavez-Rubio bout will headline an HBO “World Championship Boxing” doubleheader from Alamodome (10 p.m. ET/7 p.m. PT).