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Byline: Joe Stiglich
DENVER _ When the A's drafted Sean Doolittle in 2007, they thought they had landed their first baseman of the future.
Five years later, Doolittle finally has arrived in the majors, having transformed himself from an injury-ravaged hitting prospect to a hard-throwing left-handed reliever.
It's been a stunning_and rapid_turn of events that has amazed not only A's officials but also Doolittle.
He didn't make the switch to the mound until August last season. Starting in early April, it took him just eight weeks to zip through all three levels of the A's minor league system and land a spot in the big league bullpen, where he has …