WBC middleweight titleholder Julio Cesar Chavez Jr. is training hard to defend his title against mandatory challenger Sergio Martinez in an HBO Pay Per View bout on September 15th at the Thomas and Mack Center in Las Vegas. In his recent blog, Chavez Jr. reflects back on his worst and best memory as a fighter.

Chavez Jr. – Discuss your best and worst memory as a fighter, and which wins -- amateur or professional -- have been the most satisfying or memorable?

"My best memory as a fighter is winning the world middleweight championship. It was my dream to become a world champion. That’s why I decided to become a professional fighter. Beating Sebastian Zbik in Los Angeles to become the middleweight champion is something that I will never forget, and for so many reasons.

"Not many people believed that I could do it, and that inspired me. The select few who did believe in me encouraged me and sacrificed for me. And to win the title only a few blocks from the old Olympic, where my father won his first world title, well, that made it even more special for me.

"My father and I will always be linked together because we won our first world championship belts in the same city. My worst memory was in July, 2008, in Hermosillo, Sonora, Mexico. I had a very difficult time in the ring. It was very hot all week, and I started getting sick the day before the weigh-in and never fully recuperated after the weigh-in.

"I had a fever the night before the fight. But I went through with the fight, and the last two rounds were the most difficult time I had in the ring. I could barely walk, and was just standing up because of my pride and my heart. I threw up in the ring after the fight and had a fever."

"My most memorable victory was against Zbik and winning the middleweight championship of the world. It was a very difficult fight early, but I was able to come back in the second half of the fight and win it. It is a feeling that will stay with me forever.  To hear the ring announcer say, 'The winner and new...'

"That is something I will never forget. That is something I never want to forget. Of course, I now like hearing the ring announcer say, 'The winner, and still...,' and that’s exactly what he will say in the ring on September 15 after my fight with Sergio Martinez ends."

2 Days: Julio Cesar Chavez Jr. & Face Off With Max Kellerman: Chavez Jr./Martinez debuts back-to-back Sat., August 25 at 12:30am ET/PT and 12:45am ET/PT, respectively, on HBO.

Chavez Jr. vs. Martinez takes place Sat., Sept. 15 live on HBO Pay-Per-View beginning at 9:00pm ET/6:00pm PT.