How did he get here?: Drafted, 20th Round (2007)
Stats: 6'0", 200 lbs, Throws: Right
Age as of April 1, 2010: 21
2009 was Greenwalt's third season in the Astros organization, spending 2007 in Greeneville (0-7, 7.53 ERA/1.93 WHIP), 2008 in Greeneville and Tri-City, and 2009 in Lexington. So, this was his first full season in the minors, going from 77.2IP in 2008 to 139.1IP in 2009, and you could tell it caught up to him, as his ERA ascended in each month from July to September (after a pretty stellar April/May), though the September ERA isn't quite fair, as he only had one start.
What went right?
Home games. Within the comforts of Applebee's Park, Greenwalt had thirteen starts, and went 4-7 (irrelevant) with a 2.88 ERA/1.17 WHIP, and a .248 BAA. On the road, however, Greenwalt posted a 5.61 ERA/1.46 WHIP, and a .309 BAA.
What went wrong?
What went wrong could be attributed to the aforementioned jump in IP, so we won't be too hard on him here. So let's pick June. In five starts in June, Greenwalt had a 5.14 ERA/1.54 WHIP, allowing four of his seven total home runs, and posting an upside down groundout:flyout ratio (0.64:1), with a .331 BAA.