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Mark Teahen hit .200 with four homers last season for the White Sox and Blue Jays.
Teahen, 30, is a career .264 hitter with 67 homers, 332 RBI and a .327 on-base percentage in parts of seven seasons with the Royals, White Sox and Blue Jays. Once considered an up-and-coming third baseman in the Kansas City system, he's become more of a utilityman in recent years, learning to play first base as well as both corner outfield positions.
A left-handed hitter, Teahen struggled last season, batting .200 with four homers, 14 RBI and a .273 on-base percentage in 78 combined games with Chicago and Toronto.
Though he'll have a chance to crack the Nationals' Opening Day roster, he'll face long odds. More likely, he'll head to Class AAA Syracuse and serve as insurance in case the Nationals need help down the road.