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In 2007, the Pirates drafted Clemson's Danny Moskos fourth overall ahead of current Baltimore Orioles catcher Matt Weiters, the player most Pirates fans wanted selected. After making a solid major league debut last year with a 2.96 ERA over 24.1 innings, he is in competition for a left-handed role in the bullpen this year.
After struggling early on as a starter in his career, the Pirates decided to try him as a reliever in 2010 and it worked, as he performed much better in 2010 and 2011 before making his debut April 30th last year.
This spring he has been extremely solid, posting an ERA of 0.00 over five innings giving up three strikeouts, walks and hits each.
Moskos, with minimal innings last year, is still considered a prospect by many, and an opening-day arrival this year and equal showing in 2011 could finally allow Pirates fans to accept the draft blunder of five years ago.
ETA: Already made it to the bigs, but opening day 2012