Olympic champion Mack Horton has announced his retirement from swimming international competition. “I dearly wanted to swim in Paris but the hunger wasn’t there. I always want to give my all and I am not someone who just wants to make up the numbers, so this is the right time to step away,” Horton said in comments published by Swimming Australia on Sunday. “I have felt so privileged to represent Australia and wear the green and gold… I just hope Australia thinks I did them proud.” The 27-year-old won gold in the 400m freestyle at the 2016 Rio Olympics as well as a bronze in the 4x200m freest…