ハワイ・ウィンターリーグ
Sellers was drafted by the Oakland Athletics in the 6th round of the 2005 MLB Draft out of high school. He played with the Vancouver Canadians in 2005 and the Kane County Cougars in 2006. He then split 2007 between the Stockton Ports and Midland RockHounds. In the Hawaii Winter Baseball League, he was voted the 2007 Defensive Player of the Year. In 2008 at Midland, he hit .255 in 123 games. He was traded to the Chicago Cubs on February 2, 2009, along with Richie Robnett, for Michael Wuertz.