 He made his debut that same year with the DSL Pirates, and he spent the whole season there, slashing .280/.404/.394 with two home runs and 26 RBIs in 55 games.In 2013, he returned to the DSL Pirates and compiled a .275 batting average with two home runs, 16 RBIs, and 22 stolen bases in 45 games, and in 2014, he played for the GCL Pirates where he batted .291 with three home runs and 25 RBIs in 44 games.Polo spent 2015 with the West Virginia Power of the Class A South Atlantic League, where he batted .236 with three home runs, 26 RBIs, and 46 stolen bases in 102 games.