One of the biggest keys to the 2013 season for the Pittsburgh Pirates was their pitching depth. The Pirates used 12 different starting pitchers, and most of those starters were used in the first three months of the season. That didn't count guys like Jeff Karstens and Kyle McPherson, who were counted on pre-season as depth options, but weren't available due to injuries.

The off-season focus is always on the five man rotation, but I think that the 2013 season makes a strong case that the next five starters are far more important than the first five. Very few teams will make it with just the first five starters, which means that 6-10 group is going to be needed for a lot of starts. In the Pirates case, they had 82 starts this year from their Opening Day rotation, and 82 from the next seve...

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