Born in Chula Vista, California, Jaso graduated from McKinleyville High School in McKinleyville, California, in 2001. Jaso then attended Southwestern College, a community college in Chula Vista, California.\n', '

Jaso was originally drafted by the Tampa Bay Devil Rays in the 12th round (338th overall) of the 2003 Major League Baseball Draft.\n', '

Jaso began his professional career playing for the Low Single-A Hudson Valley Renegades for two seasons from 2003 to 2004. He had a .221 batting average in 2003, but improved to .302 in 2004 and was also a postseason All-Star for that season. He took the next step in 2005, playing for the Single-A Southwest Michigan Devil Rays. He had a .307 batting average and had 14 home runs, his most of any season to date. Also, he was a midseason and postseason All-Star. 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. In 2007, he played for the Double-A Montgomery Biscuits. His .316 batting average was second in the Southern League, on-base percentage of .408 was third among league leaders and a slugging percentage of .484 was good enough for sixth in the league. 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. Baseball America and Topps also named him as a Double-A All-Star after the season.\n', '

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