Teahen, who was a first round draft pick of the Oakland Athletics in 2002, made his Major League debut for the Kansas City Royals in 2005 after a June 2004 trade in which Oakland traded him while in Triple-A to Kansas City in the three-team deal that sent outfielder Carlos Beltran from the Royals to the Houston Astros.
A fielder who has primarily been at third base, Teahen can also play first and corner outfield. As an everyday player for Kansas City for five seasons (2005-2009), Teahen averaged 135 games played a season for the Royals, and enjoyed his finest season with them in 2006, batting .290 with 18 home runs and 69 RBI, each career MLB highs in a season.
A trade to the Chicago White Sox saw Teahen appear in 77 games and 51 games with Chicago in 2010 and 2011 respectively, and he was traded again during the 2011 season to the Toronto Blue Jays where he last notched Major League time, 27 games.
As a Major Leaguer, Teahen has 67 big league home runs to his credit, with 332 RBI in 831 games. He's a career .264 hitter in over 2,800 MLB at bats over seven seasons.