LOS ANGELES (AP) — The Canelo-Triple G rematch, expected to be the fight of the year, is off.Canelo Alvarez has withdrawn from next month’s middleweight title bout with Gennady Golovkin, two months after Alvarez twice tested positive for a banned substance.“I have always been a clean fighter and I always will be a clean fighter,” Alvarez said Tuesday during a conference call. “I want to prove without a doubt that I have never intentionally ingested clenbuterol. I have nothing to hide and I want to be open and transparent through this process. . I have never taken illegal substances and this is no different.”The May 5 fight in Las Vegas was to have been a rematch of the draw they fought last September.