German Amed Valdez Rosario (born November 20, 1995) is a Dominican professional baseball shortstop for the New York Mets of Major League Baseball (MLB).

Rosario signed with the New York Mets as an international free agent in July 2012 for $1.75 million. It was the largest international signing bonus given by the Mets. Rosario made his professional debut in 2013 with the Kingsport Mets. He started 2014 with the Brooklyn Cyclones and was promoted to the Savannah Sand Gnats in September. Rosario was promoted to the Binghamton Mets on June 23, 2016. He was named to the 2016 MLB All Star Futures Game and went 1-2 in the game. Rosario ended 2016 with a .324 batting average, 5 home runs, and 71 RBI's.

The Mets added Rosario to their 40-man roster after the 2016 season.

Rosario made his MLB debut on August 1, 2017 against the Colorado Rockies at Coors Field. In that game, Rosario recorded his first career Major League hit off of Scott Oberg. On August 11, 2017, Rosario hit his first career Major League home run off of Héctor Neris.

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