Willi Melliger was one of the most successful Swiss show jumping riders in history. He won the Silver Medal at the 1996 Atlanta Olympic Games aboard his trusted Holsteiner, Calvaro. Together with the Cantus-son he also claimed the Silver Team Medal at the Games in Sydney.
Also at the European Championships Melliger and Calvaro collected the necessary medals, among others the golden individual medal in 1995.
At the end of 2010 Melliger rode his last international competition and started to focus on the training of young horses and riders.