In 2001, the Atlanta Braves drafted Guerra as a catcher. After being converted to a pitcher in 2006, he was released by the Braves and signed with the New York Mets in 2008, where he gained traction but failed a PED test in 2009. In the half-decade plus from 2009-2014, Guerra played in international and independent leagues before the Chicago White Sox offered him a minor league contract in early 2015.\n', '

Guerra was called up to the majors for the first time on June 7, 2015. He made his major league debut a few days later on June 12, and pitched in a total of three games with the White Sox.\n', '

On October 7, 2015, Guerra was claimed off waivers by the Milwaukee Brewers as the first roster move of general manager David Stearns. The Brewers chose to make him a starting pitcher rather than a reliever. A shoulder injury kept Guerra out of play in August 2016 and forced him to skip winter league baseball in the 16-17 offseason. Despite that, Guerra earned his spot in the rotation with a consistent 2016 season in the majors.\n', '

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