On October 31, 2008, Lo signed with the Houston Astros.\n', "

Lo attended the Houston Astros' 2010 Spring Training, but was sent down to the minor leagues soon after.\n", '

Lo was recalled by the Astros on July 29, 2013. He made his major league debut on July 31, 2013, pitching one scoreless inning of relief and recording his first career strikeout in an 11–0 win over the Baltimore Orioles.\n', '

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