All of these payers have some older veteran blocking their way, but they are just an injury or poor performance away from taking over the starting job.

Lastings Milledge NYM (OF) 

Ryan Theriot CHC (2B)

Todd Linden SF (OF)

Carlos Villanueva MIL (SP)

Ryan J Braun MIL (3B)

Sean Burnett PIT (SP)

Josh Hamilton CIN (OF)

James Loney LA (1B)

Adam Miller CLE (SP)

Andrew Miller DET (RP)

Zach Miner DET (SP)

Jon Lester BOS (SP)