Oliveros began his professional career in 2006, playing for the VSL Marlins/Tigers. That season, he went 1–3 with a 2.72 ERA in 20 games (two starts), striking out 46 batters in 39⅓ innings. In 2007, he pitched for the VSL Tigers, going 2–0 with a 1.41 ERA in 27 relief appearances, striking out 59 batters in 38⅓ innings. He moved to the United States in 2008, splitting the season between the Oneonta Tigers (15 games) and Lakeland Flying Tigers (five games), going a combined 2–3 with a 2.59 ERA. He struck out 37 batters in 31⅓ innings of work. In 2009, he pitched for the Flying Tigers (34 games) and Toledo Mud Hens (one game), posting a 4–2 record with a 4.02 ERA. Despite his inflated ERA, he managed once again to average more than one strikeout per inning, with 61 strikeouts in 56 innings pitched. He split 2010 between the Flying Tigers and Erie SeaWolves, going a combined 1–3 with a 3.65 ERA in 44 games, striking out 60 batters in 44⅓ innings.\n', '

Oliveros was called up to the Tigers on July 1, 2011 to replace the injured Al Alburquerque.\n', '

On August 16, 2011, Oliveros was traded to the Minnesota Twins as the player to be named later in the earlier trade for Delmon Young. He was assigned to the Rochester Red Wings, the Minnesota Twins AAA affiliate. Between Detroit and Minnesota, Oliveros pitched in 19 games.\n', '

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