Guerra has had some success in the majors, compiling a 3.10 lifetime ERA over 162 1/3 frames. Most of those came with the Dodgers in 2011 and 2012, and he also enjoyed a productive run in 2014 with the White Sox.
That said, the 31-year-old has seen only minimal MLB action over the past three seasons. This year, Guerra appeared in 5 2/3 innings for Miami, allowing four earned runs while both walking and striking out five opposing batters. He also struggled to a 4.99 ERA with 7.6 K/9 and 3.7 BB/9 in his 48 2/3 frames at Triple-A New Orleans.