In 1997, Llunas was chosen internally by broadcaster TVE as the Spanish representative for the 42nd Eurovision Song Contest with his self-penned song "Sin rencor" ("No Hard Feelings").
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The song was performed ninth on the night of the 1997 Eurovision Song Contest, held on 3 May 1997, following the Netherlands' Mrs. Einstein with "Niemand heeft nog tijd" and preceding Spain's Marcos Llunas with "Sin rencor".