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RP Kyle McClellan, Texas Rangers
The Rangers have signed a ton of pitchers to minor league deals this offseason, as Kyle McClellan, Evan Meek, Yoshinori Tateyama, Randy Wells and Nate Robertson were all brought aboard.
McClellan has the most upside to make a significant impact—not just out of that group, but of any pitcher on a minor league deal.
Back in 2010, the right-hander was the Cardinals' primary setup man, posting a 2.27 ERA over 68 appearances.
The team moved him to the rotation the following season, and he went 12-7 with a 4.19 ERA in 43 appearances (17 starts).
He was back in the bullpen last season, but he hit the shelf with a shoulder injury in July and underwent surgery to end his season.
Still only 28, McClellan has plenty of time to turn things around. The best-case scenario would be if he replaced the departed Mike Adams in the Rangers bullpen.