Sierra began his professional career in 2006, playing for the DSL Blue Jays. That year, he hit .253 with 4 home runs, 26 RBIs, and 17 stolen bases in 69 games. He played for the GCL Blue Jays in 2007, hitting .203 with 5 home runs and 15 RBIs. In 2008, he was with the Lansing Lugnuts, with whom he hit .246 with 9 home runs, 39 RBIs, and 12 stolen bases. He split 2009 between the Dunedin Blue Jays and New Hampshire Fisher Cats, hitting a combined .292 with 6 home runs and 62 RBIs.\n', '

In 2010, he split the season between the GCL Blue Jays and Dunedin, hitting a combined .211 in 20 games.\n', '

In 2013, he played for Buffalo in the International League and the Blue Jays in the Gulf League, hitting a combined .262 in 103 games.\n', '

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