Ubaldo Matildo Fillol (locally [uˈβaldo maˈtildo fiˈʒol]; born 21 July 1950), nicknamed el Pato (in English: "the Duck"), is an Argentine football coach and former goalkeeper. He took part in the 1974, 1978 (where he won the championship with his team and was voted Best Goalkeeper) and 1982 World Cups representing the Argentine national team. He also played in the South American qualifiers for the 1986 World Cup, but he was finally not chosen for the final team that played (and won) in Mexico. He is usually considered to be one of the greatest goalkeepers and usually regarded as the best Argentine goalkeeper ever.