Four more Pittsburgh Pirates prospects have been added to the Mesa Solar Sox roster in the Arizona Fall League this year.  At the end of last month we heard that Robbie Grossman and Brock Holt were heading to the AFL.  Joining them will be left hander Nathan Baker, right handers Mike Colla and Phillip Irwin, and second baseman Jarek Cunningham.

Baker had a 3.34 ERA in 148.1 innings in high-A Bradenton this year, with a 6.4 K/9 and a 3.1 BB/9 ratio.  Colla had a surprising season in Altoona, with a 3.70 ERA in 133.2 innings, including a 3.72 ERA in 123.1 innings as a starter.  Irwin had a big season, starting out with a 2.03 ERA in 53.1 innings in high-A Bradenton, then moving up to Altoona, where he posted a 3.81 ERA in 87.1 innings, with a 69:10 K/BB ratio.

Cunningham had a .258/.32...

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