Kelvin de Jesús Herrera Mercado (born December 31, 1989) is a Dominican professional baseball pitcher for the Chicago White Sox of Major League Baseball (MLB). He previously played for the Kansas City Royals and Washington Nationals. Herrera is a two-time MLB All-Star. \n', '

The Kansas City Royals signed Herrera as an international free agent in December 2006. From 2007 through 2013, he played for various teams in the Royals\' farm system. Through 2010, he was in Class A or below; he then reached both Double-A and Triple-A in 2011. Along with Wil Myers, Herrera represented the Royals at the 2011 All-Star Futures Game.\n', '

Herrera was called up to the majors for the first time on September 21, 2011. That day, he gave up three earned runs over two innings, against the Detroit Tigers. He made one other appearance, on September 26, retiring all three batters he faced.\n', '

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