Tuiasosopo, 26, began his career with the Mariners organization in 2004. He was first called up to the major by the Mariners in Sept. 2008 and played in 14 gases with Seattle that season. In 2009 he appeared in seven games for the Mariners and played in 50 games with Seattle in 2010. During his time with the Mariners he played first base, second base, third base, shortstop, and left field. In 71 total games in the majors he hit .176 with 49 strikeouts. Tuiasosopo sent the 2012 season with the Triple-A Buffalo Bisons, playing primarily third base and right field.
He is the brother of former NFL quarterback and current UCLA Bruins tight ends coach, Marques Tuiasosopo and former NFL fullback Zach Tuiasosopo. Their dad Manu Tuiasosopo, played defensive lineman in the NFL.