Ubaldo Matildo Fillol ([uˈβaldo maˈtildo fiˈʎol]; born 21 July 1950), nicknamed el Pato (in English: "the Duck"), is an Argentine football coach and former goalkeeper.

[1][2][3] Born in San Miguel del Monte, Fillol took his first steps as goalkeeper in an amateur club of the city, where he spent four years.

[4][5] In the 1970 Metropolitano championship Fillol stopped the first penalty in his career to Gimnasia y Esgrima LP forward Delio Onnis.

He was called up for the Argentina national team, where he was part of the roster at the 1974 World Cup (the other goalkeepers were Daniel Carnevali and Miguel Ángel Santoro).

[11] After a short tenure as Racing manager, Fillol returned to his role as goalkeeping coach for Argentina, also working at the 2006 FIFA World Cup.

[12] Fillol continued his career coaching goalkeepers at River Plate, but he resigned after a match against San Lorenzo in which Juan Pablo Carrizo refused to accept his gesture of support after a mistake that allowed the rival team to score a goal.

Fillol alleged he felt "humillated" by Carrizo and showed his desire to continue in the club but only working with youth players, as he had done before.

[14] For his River Plate career, he was the counterpart of Hugo Orlando Gatti, another great Argentine goalkeeper who played in the nemesis team, Boca Juniors.