The Rangers designated Guillermo Moscoso for assignment, according to Evan Grant of the Dallas Morning News (on Twitter). The 27-year-old right-hander appeared in one game for the Rangers last year, after appearing in ten contests in 2009. He has a 4.30 ERA with 8.6 K/9 and 4.9 BB/9 in his brief major league career.
Moscoso started 22 games for the Rangers' Triple-A affiliate last year, posting a 5.18 ERA with 7.8 K/9 and 3.6 BB/9 in 123 1/3 total innings. He has a 3.46 ERA with 8.7 K/9 and 2.4 BB/9 in parts of six minor league seasons.
The Rangers acquired Moscoso in the 2008 deal that sent Gerald Laird to Detroit. The year before the trade, the righty threw a perfect game in the minors. Baseball America said before the 2010 season that Moscoso's "best asset is his ability to pound the bottom of the strike zone with a low-90s fastball." He could become a long reliever or swingman in the major leagues and may be able to start if he hones his secondary pitches, according to BA.