Marcelo Andrés Ríos Mayorga is a Chilean former world No. 1 tennis player. Nicknamed El Chino and El zurdo de Vitacura, he became the first Latin American player to reach the top position on the Association of Tennis Professionals (ATP) singles rankings in March 1998, holding the spot for six weeks. He also held the top ranking in juniors. At 1.75 m, Ríos is the shortest man to hold the number 1 ranking in men's tennis.