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Good Q.
In short, there's no shortage of guys who have a Bill Campbell, Mike Schooler year or two in the 9th inning. Particularly the 8k, 4BB guys with good fastballs up in the zone, seem susceptible to putting a little run together.
If and when he implodes, how many guys do you think will say they saw that coming, too :- )
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Personally don't want any part of that 2010 closer scenario, but maybe I'm just being stubborn.
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Still, kudos to him. He wants the ball, he goes after the hitters and he's having a good year. Good for him.