Trevor Rosenthal

The St. Louis Cardinals will receive a boost to their bullpen with Thursday's return of Trevor Rosenthal.

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The St. Louis Cardinals placed reliever Trevor Rosenthal on the 15-day disabled list Tuesday with a right shoulder injury. 

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When Adam Wainwright tore his Achilles tendon in April, the St. Louis Cardinals were left without their true ace—let alone one of baseball’s top pitchers—for most of the season.

With the St. Louis Cardinals only three wins away from the 2013 World Series title, the team and its fans would obviously be disappointed if this October run ended without a championship.

The St. Louis Cardinals are engaged in a tight battle already in the NL Central, and some sobering news on Friday will make their fight to stay alive in that race a little bit tougher.

The National League Central is filled with talent, and Chicago Cubs pitcher Jeff Samardzija leads the list of players who are going to have breakout seasons.

With the Houston Astros no longer in the division, teams in the NL Central will face each other 19 times this season. 

Last season featured Andrew McCutchen of the Pittsburgh Pirates as the breakout star of the division. There probably won't be a performance like that from any of the players on this list, but these players will certainly make a name for themselves this season.

Finding a bunch of players on the verge of a "breakout" season isn't necessarily all that hard. Finding a bunch of almost universally-undrafted players who are on the verge of a "breakout" season? That's a little tougher.

Anyone can make a case for the Rays' Matt Moore, the Cubs' Anthony Rizzo or the Mets' Matt Harvey, all young promising players ready to take the step from good to great as breakout candidates in 2013. But each of them were selected in every draft out there, often in the middle rounds.