Above all, 2013 has been a disappointment for the Seattle Mariners. Safeco Field's new dimensions, a humongous Jumbotron and a power-laden roster were supposed to turn the Mariners into postseason contenders. Instead, they sit in fourth place in the A.L. West, on the verge of yet another 90-loss campaign.
But as always there have been some bright spots; some unknown players to step up and give the baseball world a reason to watch. And as is to be expected with a disappointing team, there have been players that simply haven't lived up to expectations.
Here are the five most surprising and disappointing players of 2013.
All stats via ESPN.com, MLB.com and baseball-reference.com.