Ronald José Herrera Aular (born May 3, 1995) is a Venezuelan professional baseball pitcher in the Texas Rangers organization. He has previously played in Major League Baseball (MLB) for the New York Yankees.\n', '

Herrera signed as an international free agent with the Oakland Athletics in December 2011. He made his professional debut in 2012 with the Rookie-level Dominican Summer League Athletics, going 2–4 with a 2.47 ERA in 58 innings. His 2013 season was split between the Rookie-level Arizona Athletics and the Class A Short Season Vermont Lake Monsters, accumulating a 7–4 record with a 4.02 ERA in 77 innings. \n', '

In 2014, the Athletics traded Herrera and Jake Goebbert to the San Diego Padres for Kyle Blanks. He split that season between the Class A Beloit Snappers and the Class A Fort Wayne TinCaps, accumulating a 6–9 record with a 3.92 ERA in 132.1 innings. In 2015, he split the season between the Class A-Advanced Lake Elsinore Storm and the Double-A San Antonio Missions, accumulating a 8–7 record with a 4.08 ERA in 145.2 innings. \n', '

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