The Cubs claimed 29-year old RHP Guillermo Moscoso off waivers from the Toronto Blue Jays today
Moscoso had a fine rookie season for the Oakland Athletics in 2011, going 8-10 with a 3.38 ERA and a 1.09 WHIP, allowing just 102 hits in 128 IP, with a 38/74 BB/K. He was then traded to the Colorado Rockies along with LHP Josh Outman for OF Seth Smith in January 2012.
Moscoso had a horrible year in 2012, however (6.12 ERA and 1.72 WHIP in 23 games and 50.0 IP for the Rockies, but with a very decent 2.70 ERA and a 1.37 WHIP away from Coors Field), and was demoted to AAA Colorado Springs, where he continued to struggle (6.13 ERA and a 1.56 WHIP in 18 games and 95.1 IP).
He was claimed off waivers by the Kansas City Royals last November, and then was claimed off waivers again (this time by Toronto) earlier this month. He was ineffective in five Spring Training outings for KC and TOR (12.86 ERA and 2.57 WHIP).
The Cubs probably noticed Moscoso while scouting eventual Rule 5 pick Hector Rondon, because Moscoso was Rondon's teammate on the Caracas club in the Venezuelan Winter League this past off-season, putting up a 3.10 ERA and a 1.14 WHIP in 29 IP (26 hits allowed and a 7/18 BB/K).
Moscoso's 2012 troubles might be at least partly attributable to his being an extreme fly ball pitcher, probably not the best characteristic to have if you're playing half your games in the thin air of Denver or Colorado Springs. But even so, why would the Cubs claim Moscoso and waste a 40-man roster slot on a struggling 29-year old pitcher who is out of minor league options?