[1] He played in Major League Baseball (MLB) for the Tampa Bay Rays, Seattle Mariners, Oakland Athletics, and Pittsburgh Pirates.

In 2006, he took another step, playing for the High Single-A Visalia Oaks and his season included being named to the midseason All-Star team.

His best minor-league season included being named to the midseason and postseason All-Star team and was also Topps Southern League Player of the Month for August.

[7][8] Jaso sought salary arbitration before the 2014 regular season began, and eventually agreed to a one-year contract worth $2.3 million.

[9] On January 10, 2015, Jaso was traded to the Tampa Bay Rays with Daniel Robertson and Boog Powell for Yunel Escobar and Ben Zobrist.