Every season, a closer emerges out of nowhere.
In 2011, Jordan Walden stole the job from Fernando Rodney and Sergio Santos earned the closer role after Matt Thornton had four blown saves in April.
In 2010, Chris Perez was able to pick up 23 saves when Kerry Wood got injured, and John Axford came to the rescue when Trevor Hoffman's era skyrocketed to 5.89.
In 2009, Andrew Bailey started the year as the A's third option for closer, but he wound up winning AL Rookie of the Year after recording 26 saves. Similarly, David Aardsma began as Brandon Morrow's setup man but finished the year with 38 saves.
Who will steal the show in 2012?
I've compiled a list of the top 15 relievers who could end up closing by summer.
It's no guarantee that any of these guys will assume closer roles, but they are certainly worth putting on your watch list.