Delgado, 26 in mid-April, is a Venezuelan right-hander perhaps best-known for being part of the blockbuster Red Sox-Marlins trade in November 2005 that sent Hanley Ramirez and Anibal Sanchez to Florida and Josh Beckett and Mike Lowell to Boston.
He didn't have a massive amount of success in the Florida system, repeating Double-A in 2008 as a reliever after a mediocre 2007 as a swingman. He did pitch in two big-league games for the Marlins as well as appear in the 2008 Futures Game for the World team. Seattle plucked him off waivers from Florida in spring training last year, and he was lit up or injured all season in AAA Tacoma (6.59 ERA, 71 H in 56 IP).
Just looking at Delgado's numbers, I can hazard a guess: he's got great velocity but a straight fastball (less-than-killer K numbers, lots of hits) and mediocre control (high BBs).
(Checks the web)
Boom. I like this signing. Changes of scenery sometimes do wonders for pitchers like this guy.