Martín Sebastián Rivas Fernández (born 17 February 1977) is an Uruguayan former footballer who played as a defender.
Born in Montevideo, the capital and largest city of Uruguay, he started to play for Danubio then in January 1998 signed by Inter, which he is dual Uruguayan-Spanish citizen, made him not occupy any non-EU quota.
On 17 March 1998, he appeared in the 1997–98 UEFA Cup quarterfinal return leg against FC Schalke 04.
[3] The following season he was loaned to Málaga, prior to return to Uruguay where he ended his career in 2007, aged 30.
[4] He played 2 caps with his national team and was in the squad of 1997 FIFA Confederations Cup.