CRAIG STAMMEN

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Tanner Roark's MLB career has so far been an unlikely success story filled with very few failures for a guy who just a year before he debuted in 2013 lost 17 games at the Triple-A level.

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Craig Stammen has needed surgery on his throwing arm only once before — Sept.

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Blake Treinen made 15 appearances for the Nationals last season, many of them impressive outings that turned some heads within the organization.

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