Santiago Rosario (July 25, 1939 – September 6, 2013) was a first baseman and corner outfielder who played briefly for the Kansas City Athletics during the 1965 season.

[1][2] At age 20 Rosario was selected for the baseball team that represented Puerto Rico at the 1959 Pan American Games held in Chicago, Illinois.

′′Chago′′, as his teammates dubbed him, helped offensively and defensively his team, which won a silver medal in the event as a runner-up for the Venezuelan squad.

After that, he joined the Mexican League from 1973 through 1976, and also was a member of the Leones de Ponce Puerto Rican team that clinched the 1972 Caribbean Series.

Nevertheless, Rosario dashed from the on-deck circle and hit Ranew over the head with his bat, opening up a deep three-inch gash.