In order to make room on the 40-man roster for Adrian Beltre, right-handed pitcher Guillermo Moscoso was designated for assignment. The Rangers have 10 days to trade, release or outright Moscoso to the minors.
Moscoso pitched once for Texas in 2010, giving up two runs in tw0-thirds of an inning (May 20 vs. Baltimore). He was in Triple-A Oklahoma City the rest of the season and was 7-7 with a 5.18 ERA in 23 games (22 starts).
Moscoso came to the Rangers in a trade with the Detroit in Dec 2008 and appeared in 11 games over his two seasons.
He seemed the logical choice to come off the 40-man roster once the Rangers made the deal for Beltre. And this means they are once again full on that roster.