Reuters) – Briton Anthony Joshua has said his first career defeat at the hands of Andy Ruiz Jr. was down to a lack of experience and he has become a “smarter” fighter ahead of December’s rematch. Mexican-American Ruiz produced one of boxing’s biggest upsets when he dethroned the previously undefeated world heavyweight champion with a seventh-round stoppage at New York’s Madison Square Garden in June. “It wasn’t burnout. The issues I faced in the last camp, it’s just down to lack of experience,” he told BBC. “Even though it was at a high level, we were still finding experience. “Andy Ruiz is good but I don’t think he should beat me twice. I used to hear guys say you have to take a loss and I would think ‘why?'” “Now I can understand it and know what it takes. I have more understanding now and my ears are open to new information so that’s making me smarter as a fighter. Anyone can be hungrier, I am smarter.” The WBA, IBF and WBO heavyweight title rematch — dubbed the ‘Clash on the Dunes’ — will take place in Saudi Arabia on Dec. 7 after former Olympic champion Joshua triggered a rematch clause. “The blessing is I have a second chance and here we are,” the 30-year-old added.