Rosin was selected in the Rule 5 draft by the Mets from the Phillies, and then had his right shipped to Los Angeles. Now, the Rangers will become the third team to give him a look. The 25-year-old put up a 4.33 ERA with 6.8 K/9 and 2.5 BB/9 in 126 2/3 innings for the Phillies' Double-A affiliate in 2013.
Guerra, 28, spent time as the Dodgers closer in 2011, and has a lifetime 2.90 ERA in 102 1/3 MLB innings. But he fell out of favor in Los Angeles last year after posting a rough 6.75 ERA in 10 2/3 frames, and saw his chances at a pen slot evaporate as the team made several additions over the offseason.