After tonight's game, the Pirates optioned Evan Meek to Triple-A. The team will make a corresponding move tomorrow.
Clint Hurdle prefers to have two left-handers, so the favorites to replace Meek are Daniel Moskos and Doug Slaten. Moskos is on the 40-man roster, so no corresponding move would need to be made. Slaten is not on the 40-man roster, so a spot would have to be cleared if he was added.
Statistically, Slaten has had a much better year than Moskos in Triple-A. He's got a 0.69 ERA in 13 innings, with an 8:3 K/BB ratio. Moskos has a 3.68 ERA in 7.1 innings, with a 6:7 K/BB ratio. Surprisingly, the struggles for Moskos this year have been against left handers, with a .333 BAA. Slaten has a .200 BAA versus left handers, and a .107 vs right handers.
Slaten does have the advantage of being a few years older than Moskos, and having more experience. But that experience includes a career .241 BAA and a .666 OPS against left handers in the majors.
Tim is the owner and editor in chief of Pirates Prospects. He started the site in January 2009, and turned it into his full time job during the 2011 season. Prior to starting Pirates Prospects, Tim worked with AccuScore.com, providing MLB, NHL, and NFL coverage to various national media outlets, including ESPN Insider, USA Today, Yahoo Sports, and the Wall Street Journal. He also writes the annual Prospect Guide, which is sold through the site. Tim lives in Bradenton, where he provides live coverage all year of Spring Training, mini camp, instructs, the Bradenton Marauders, and the GCL Pirates.