Clay attended Washington Park High School in Racine, Wisconsin. He was named a high school All-American in 2006 and played in the U.S. Army All-American Bowl game. A 4-star recruit, he committed to Wisconsin on national signing day after declining offers from Tennessee, Ohio State, Nebraska, and Iowa. After graduating from high school and before the start of summer football camp, Clay was notified by the NCAA that his grades had not met the requirements to play collegiate football. He had recorded a 2.7 core GPA and received a 17 on his ACT. Clay attended summer school to complete the required course work, then rejoined his teammates and began practicing with the Badgers. His late start forced him to redshirt in 2007.
As a redshirt freshman in 2008, Clay saw his first action on the field against the University of Akron, where he posted 71 yards and his first collegiate touchdown on just 12 carries. He finished the season second on the team and seventh in the Big Ten Conference in rushing with 884 yards on 155 carries and nine touchdowns. In 2009, Clay led the Big Ten and ranked eighth in the country with 1,517 rushing yards. His 18 rushing touchdowns also led the Big Ten and tied for seventh in the nation. On November 23, 2009, Clay was named Big Ten Offensive Player of the Year, the third Badgers' player to be so named Big Ten, joining fellow running backs Ron Dayne and Brent Moss. Clay was on the cover of the December 11, 2009 edition of Sports Illustrated, an issue that featured the best sports photos of 2009. The picture was taken during the Michigan game at Camp Randall Stadium. Clay entered the 2010 football season on the preseason watch lists for the Doak Walker Award, the Walter Camp Award, and the Maxwell Award. He was selected as a Playboy All-American. An MCL injury sidelined Clay for the last three 2010 regular season games, damaging his chances at the Heisman. Clay was named one of three finalists for the 2010 Doak Walker Award, which is given annually to the nation's top running back. The other two finalists were Kendall Hunter of Oklahoma State and the winner of the award, LaMichael James of Oregon. For the 2010 season, Clay finished with 1,012 rushing yards and 14 rushing touchdowns.
Statistics
Professional career
On January 7, 2011, Clay announced he would forgo his senior season to enter the 2011 NFL Draft. Clay went undrafted in the 2011 NFL Draft. Clay was signed by the Pittsburgh Steelers as an undrafted free agent on July 26, 2011. He waived for final cuts on September 2, 2011 but was re-signed two days later to the practice squad. On December 23, 2011, he was added to the team's active roster. He scored his first touchdown on his first carry in the NFL on December 24, 2011, a 10-yard score. Clay was waived/injured on August 14, 2012, but subsequently reverted to injured reserve on August 16. He was given an injury settlement and released from injured reserve on August 20.
