This is the last of a 10-column series designed to help owners playing in keeper league (KL) and dynasty formats address their weak spots over the next three to five seasons. The effort has been to list our favorite players and prospects who could 1) be relatively available in your leagues; and 2) earn double-digit dollars sometime between 2013 and 2015.

Our filter uses the following criteria for pitchers:

• Player must be growth-age—27 years old—or younger as of April 1
• Player must have earned less than $10 in 2012
• Player must have accumulated at least 50 IP above A+ ball

Relief pitchers bring a unique set of issues to our series. For one, while dominant RPs are certainly roster-worthy in deep dynasty formats,...