He developed a reputation as a hitter, with a .403 batting average, 104 hits and ninety runs scored, while drawing sixty walks, in 2002.

He led Class A Short Season Northwest League second basemen in fielding percentage (.969).

On October 13, 2006, Kiger became the first player since Bug Holliday in 1885 to make his major league debut in a postseason game when he appeared as a defensive replacement for D'Angelo Jiménez at second base for the Athletics in Game 3 of the 2006 American League Championship Series (ALCS).

He was added to the Athletics roster in the ALCS after starting second baseman Mark Ellis was injured in the 2006 American League Division Series.

In 2007, he played in the New York Mets organization and was invited to major league spring training by the Seattle Mariners in 2008.