Zemanski attended the Cuyahoga Valley Christian Academy, where he was a 2005 NSCAA All-American, and played college soccer at the University of Akron. He was named the Zips' Newcomer of the Year in 2006, was named to the All-MAC Second Team and was an Academic All-MAC honoree as a junior in 2008, and was named to the CoSida Academic All-America Third Team, the All-Mid-American Conference Second Team, the MAC Academic Team, and was one of ten finalists for the Lowe's Senior CLASS Award as a senior in 2009.
Zemanski was drafted in the third round (forty-seventh overall) of the 2010 MLS SuperDraft by Chivas USA.[2] He made his professional debut on April 17, 2010, in a game against Houston Dynamo,[3] and scored his first professional goal on the opening day of the 2011 MLS season, a 3–2 defeat to Sporting Kansas City.[4]