Pittsburgh made a pair of minor trades, acquiring right-hander Zach Stewart from the Red Sox for a player to be named later and getting right-hander Vin Mazzaro and first baseman Clint Robinson from the Royals for minor leaguer pitchers Luis Santos and Luis Rico.
Boston got Stewart from Chicago in the Kevin Youkilis trade, but designated him for assignment last week. He has a 6.82 ERA in 103 career innings, but Stewart has a decent track record in the minors and could emerge as a useful back-of-the-rotation starter or middle reliever.
Mazzaro is a similar story in that the Royals got him from the A’s for David DeJesus and then designated him for assignment following a 6.72 ERA in 72 innings. He doesn’t have much upside, but gives the Pirates some more pitching depth.
As a 27-year-old first baseman Robinson was never going to get a chance in Kansas City behind Billy Butler and Eric Hosmer, but he’s consistently crushed minor-league pitching and offers 20-homer power with good strike zone control. Robinson hit .309 with a .396 on-base percentage and .493 slugging percentage in two seasons at Triple-A, so it’s nice to see the 6-foot-5, 250-pounder go somewhere he might actually get an opportunity.