When it comes to fantasy baseball keeper leagues, deciding whether a breakout player is for real or not is one of the toughest decisions of the year.
With only a set number of carry-over keeper spots to use, wasting one on a one-hit wonder who regresses next year over a solid veteran option could be the difference between winning and losing your league.
Some keeper leagues allow for a set number of position players and pitchers to be rolled over to your roster for the following season at no cost to the upcoming year's draft. Others allow a set number of players to be kept, but at the price of the draft pick in the round in which you selected them the previous season.
This list will focus on leagues in which no draft picks are tied to keepers, and will be more for players in deeper leagues where more than two or three keepers are allowed.
For example, I'm in a 14-team rotisserie league where five position players (13 starting spots) and three pitchers (nine starting spots) are allowed to be kept. Obviously most of these guys would not be keepers in something like a 10-team, three-keeper format.
With that in mind, here are the 10 fantasy stars of 2013 I feel are not worth using a keeper spot on when the season comes to an end.
*Advanced statistics courtesy of FanGraphs.com.