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Michael Wacha, RHP
2013: 14 G, 8 GS, 3.21 ERA, 56.0 IP, 51 H, 17 BB, 56 K
The future ace of the staff, Wacha has made a big impression in a short period of time and he will be headed to his first postseason. He has split time in the majors between the rotation and the bullpen, so he should fit in fine in either position or in a long relief role.
Trevor Rosenthal, RHP
2013: 70 G, 2.74 ERA, 72.1 IP, 61 H, 20 BB, 103 K
Rosenthal blew batters away last October with his fastball. As of right now, the Cardinals are going with a "fluid" situation when it comes to the closer position, due to regular closer Mujica's struggles (according to Goold). But Rosenthal is perhaps the best candidate should Mujica not improve.
Kevin Siegrist, LHP
2013: 41 G, 0.48 ERA, 37.1 IP, 15 H, 18 BB, 50 K
Siegrist provides us with an incredibly strong, yet small sample size for what he can do. Matheny has faith in him, bringing him in during key situations such as the ninth inning of Monday's one-run game against the Nationals. He'll be a strong lefty option out of the pen.
John Axford, RHP
2013: 74 G, 4.08 ERA, 64.0 IP, 72 H, 26 BB, 64 K
Mozeliak's relief trade of 2013, Axford came to the team from the rival Brewers and a change in scenery has been doing him well. He's posted a 1.74 ERA in the past month. A former closer, he is another, more experienced option to take Mujica's prior role.
2013: 63 G, 2.53 ERA, 64.0 IP, 57 H, 5 BB, 46 K
Whether he earns back the closer role or not, Mujica will be an important part of the Cardinals postseason run. He stepped up this year when he was desperately needed (after Jason Motte's injury).
2013: 64 G, 2.39 ERA, 60.1 IP, 65 H, 13 BB, 35 K
A groundball pitcher, Maness is the perfect option when Matheny needs someone to take care of inherent runners. He has made inducing the double play an art form, which should be important in close games.
2013: 61 G, 2.36 ERA, 34.1 IP, 25 H, 11 BB, 28 K
The second southpaw in the bullpen, Choate will be called upon in the late innings when Matheny needs a lefty specialist.
Carlos Martinez, RHP
2013: 17 G, 5.76 ERA, 25.0 IP, 30 H, 9 BB, 21 K
Similar to Wacha, Martinez is a young arm with a bright future. Having experience in a starting role, he will also be a long relief option.