10. Sean Doolittle
Doolittle will always be a fan favorite in DC, and for good reason. The "Doo" chant in playoff games will always be one of my favorite memories as a fan. While it's hard to hate Sean as a player and a person, and it sucks to have to put him this low, he most likely won't be a major contributor to the major league roster this year. He still provides good depth, especially being a left handed reliever, and was only a minor league addition. I obviously hope for the best for Sean and hope the injuries aren't a major factor this year, but being realistic puts him lower on the list.