Ruben Sierra is a former Major League Baseball outfielder. Sierra goes by the nicknames El Caballo and El Indio. Over 20 seasons, Sierra played for the Rangers, Athletics, Yankees, Tigers, Reds, Blue Jays, White Sox, Mariners and Twins. Ruben Sierra has hand signed this New York Yankees 8x10 Photo. All World Memorabilia Hologram and Certificate of Authenticity.