Collegiate Mattern played collegiate soccer at the
University of South Carolina where she was a two-time All-American in addition to being a Freshman All-American. In 2009, she was a consensus first team selection after earning All-America nods by the NSCAA, Soccer America and the Lowe's Senior CLASS Organization. She was the 2007 SEC Defensive Player of the Year, becoming the first sophomore in conference history to earn the honor, and is a four-time All-SEC selection. In her final season, she was captain of a defense that was ranked No. 9 in the nation and led the SEC in every defensive category en route to 15 shutouts and a berth in the NCAA Round of 16.
Club Mattern was selected by
Atlanta Beat as the first choice of the third round and 21st overall selection in the
2010 WPS Draft. She was the Beat's second pick and the fourth defender overall selected in the WPS Draft. In late 2010 she joined the
Charlotte Lady Eagles. In the summer of 2011 Mattern joined
FC Twente together with
Danielle de Seriere. With
Ashley Nick the Dutch club already had an American player. Due to an injury Mattern missed the first couple of matches. Since 2013 she has played for the
Carolina Elite Cobras in the United States and for
Mallbackens IF in Sweden. ==References==