He improved, according to The Observer, because he improved his mechanics.
"Koller is now getting his arm up," Fayetteville manager Gene Roof told The Observer. "We've been telling him that all year. He's decided the last two starts that he was going to do it. Now everything is thrown out of the same (arm) location."
Whether it was his arm location or something else, Koller couldn't keep it up. He returned to Fayetteville for nine more games in 1990, marking the end of his brief career.
Koller's career began in 1988, taken by the Tigers in the 32nd round of the draft out of Glen Este High School in Ohio.
At Glen Este, Koller had a one-hitter and a two-hitter, striking out 20 batters between the contests, according to The Cincinnati Enquirer.
With the Tigers, Koller started at rookie Bristol. He went 8-2 over 13 starts, with a 2.60 ERA.
He moved to single-A Fayetteville for 1989. He went 5-9 there over 26 starts. His ERA crept up to 3.35. He had a May span where he didn't give up an earned run over three starts, but still got a no-decision each time.
He returned to Fayetteville for 1990 and he was to start Opening Day for the Generals, but a sore muscle pushed back that start. In all that year, he got nine starts, went 2-2 and had a 3.06 ERA. His season cut short, Koller's career ended short of AA.
- Fayetteville Observer, Aug. 29, 1989: Koller, Murphy lift Generals to 7-1 win
Players/Coaches Featured: 2,293
Made the Majors: 951-41.5%
Never Made Majors:1,342-58.5%-X
5+ Seasons in the Majors: 398
10+ Seasons in the Minors:240