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It looks like Wilhelmsen is predominantly a FB pitcher without much in offspeed offerings, ergo he may be destined for the pen.
From milb.com
Wilhelmsen relied almost entirely on his fastball in the outing.
"The fastball was definitely working," he said. "I had trouble throwing my curveball. It didn't have as much break. I probably got only one or two over. I don't know if I threw a changeup for a strike. Luckily the fastball was there and that was enough to not let any runs come in."
http://web.minorleaguebaseball.com/news/article.jsp?ymd=20100812&content...