Guillermo Andrés Rivera Aránguiz (Latin American Spanish: [ɡiˈʝeɾmo anˈdɾes riˈβeɾa aˈɾaŋɡis]; born 2 February 1989) is a Chilean former professional tennis player.

[1] Rivera represented Chile in March 2011 against the United States, making his Davis Cup debut by playing the fifth rubber against John Isner, losing the match 3–6, 7–6, 5–7.

[2] It would be the only Davis Cup match of his career.