Magneuris Sierra is the only Miami Marlins prospect who has experience playing against the Marlins at the major league level. That experience came May 8-10, 2017 at Marlins Park, Sierra’s first full series following his initial call-up. The Dominican outfielder didn’t seem the least bit intimidated: 5-for-11 (.455 BA), 6 R, 2 BB while playing every inning in a St. Louis Cardinals sweep.
Sierra’s speed proved to be a deciding factor in the middle game. With one out in the ninth inning, AJ Ramos rushed the throw to first on his grounder back to the mound, moving the eventual winning run into scoring position: