Jeremy Bonderman had only 27 minor league starts under his belt before joining the big league rotation (at the age of 20). Justin Verlander had just 20. Andrew Miller had pitched three games of relief before joining the Tigers as a reliever during their stretch run in 2006, and just more than a month as a minor league starter in 2007 before becoming a part of the team's rotation. Rick Porcello was in the majors after 24 professional starts, while Andrew Oliver made just 14 starts before his debut. You get the picture.
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