By Keith Idec

Gennady Golovkin’s vicious assault on Canelo Alvarez’s character continued Sunday.

The undefeated middleweight champion called his upcoming opponent “a liar” during an event in Los Angeles designed to promote their HBO Pay-Per-View rematch September 15 in Las Vegas. Golovkin also reiterated that he feels the Mexican superstar has shown no respect whatsoever for boxing by the way he has handled failing two performance-enhancing drug tests in February.

“Canelo, he is not a champion,” Golovkin said before an open workout at Banc of California Stadium. “He is a liar who has no respect for the sport of boxing or its fans. I want to stay world champion and bring all my belts home. I am ready to star in another ‘Big Drama Show.’ ”

The 36-year-old Golovkin has been bothered even more by the aftermath of Alvarez twice testing positive for clenbuterol, a banned substance, than Alvarez actually failing those tests.

The Kazakhstan native doesn’t believe Alvarez has accepted any real responsibility for what caused his six-month suspension and the cancelation of their rematch May 5. The 28-year-old Alvarez has maintained all along that contaminated meat eaten in his home country caused clenbuterol to turn up in his system.

“Was I upset that Canelo failed two drug tests? Yes,” Golovkin said. “But I was more upset at Canelo’s team. The excuses they gave, their attitude and Canelo’s reaction, it showed that they have no respect for the sport or the fans. They showed their real faces. They are fakes. I do not feel anger toward him because the rematch was canceled the first time.  But I did lose all respect for him. Canelo is not the biggest name in boxing, just the biggest scandal."

Golovkin (38-0-1, 34 KOs), the WBA/WBC/IBO middleweight champion, is slightly favored to defeat Alvarez (49-1-2, 34 KOs) in their second fight. They’ll meet again one day shy of the one-year anniversary of their dubious draw at T-Mobile Arena, also the site of their rematch.

Keith Idec is a senior writer/columnist for BoxingScene.com. He can be reached on Twitter @Idecboxing.