Sonnanstine, 28, has pitched parts of five seasons with the Rays. The right-hander began his career as a starter but was used primarily as a reliever the past two seasons. Sonnanstine is 28-31 with a 5.26 career ERA. He split the 2011 season between Tampa and Triple-A Durham, starting nine games in the minors and four with the Rays. He was drafted in the13th round of the 2004 draft out of Kent State.
The Cubs also made official the signing of the right-handed Corpas, first reported by ESPNChicago.com last week.
Corpas, 29, is 12-16 lifetime with 34 saves and 51 holds and a 3.95 ERA. He helped the Colorado Rockies get to the 2007 World Series, assuming the closer's role in midseason from Brian Fuentes, who went down with an injury. He ended up with 19 saves and a 2.08 ERA that year.
Corpas had Tommy John surgery on his right elbow in September of 2010 and spent the 2011 season in the Rangers organization rehabbing. He did not pitch in an organized game. Corpas pitched two months in winter ball this offseason in Panama. He will get a chance to make his way into the Cubs' bullpen with Sean Marshall getting traded to the Reds last and right-hander Jeff Samardzija competing for a rotation spot.
Bruce Levine covers the Cubs for ESPN 1000 and ESPNChicago.com.