In January 2012, he joined to Primera División club Universidad de Chile, after the good work of Azul Azul, earning under Jorge Sampaoli's orders the Torneo de Apertura and the heart of the fans.
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In June 2011, Ruidíaz was called up by the coach Sergio Markarián to the Copa América held in Argentina, being member of the squad that finished in the tournament's third place, after of the 4–1 victory over Venezuela, playing one game for the contest against the Chilean football team.
Raul Malo | José Raúl Capablanca | Raúl Castro | Raúl Scalabrini Ortiz | Raúl Alfonsín | Raúl Juliá | Raul Julia | Raúl di Blasio | Raúl Ramírez | Raúl Prebisch | Raúl Mondesí | Raúl Labrador | Raul Boesel | Raúl Reyes | Raul Morales | Raul Hilberg | Raul Blanco | Raúl Velasco | Raúl Soldi | Raúl López | Raul Gardini | Raul Domingos | Raul Bocanegra | Raúl Beceyro | Raul Yzaguirre | Râul Vadului | Raul Seixas | Râul Scurt | Raul Roco | Raúl Roa García |