I was just thinking about this for some reason. On April 15th, 2004, Jon Lester had a bad game in his only appearance as a reliever. In 0 IP (he didn't get an out), he gave up 6 hits, 9 ER, 3 BB and 0 K's.
Here's his final line as a starter: 90.1 IP, 3.39 ERA, 1.22 WHIP, 2.85 K/BB, 9.66 K/9, 3.39 BB/9, 7.57 H/9
Pretty damn good considering he was only 20 last year. I expect big things if he keeps it up and remains healthy. That health has been a bit of a concern, as it is with most high school pitchers.