slugging percentage in 336 at bats. Duncan made his major league debut on July 20, 2007, as the designated hitter against the Tampa Bay Devil Rays, and recorded his first career hit and RBI. The next day, he hit his first major league home run against the Devil Rays, and the following day had his first multi-home run game, going deep twice in front of the Yankee Stadium crowd. Duncan later hit his fourth Major League home run at Yankee Stadium on July 31, 2007 against the Chicago White Sox. He spent time in 2008 with both the major league Yankees, and the Scranton/Wilkes-Barre Yankees, before suffering a shoulder separation. Duncan remained in Scranton/Wilkes-Barre for the remainder of the season. He was designated for assignment that offseason, but cleared waivers and remained in the Yankees organization. On July 31, 2009, Duncan was recalled from Scranton/Wilkes-Barre temporarily as an extra bat. He was optioned the following day and recalled again on September 7. In each of his three starts he went 1 for 3 and recorded 1 RBI. Duncan was named the International League Most Valuable Player for 2009 leading the league in home runs and RBIs. Following the 2009 season, Duncan was outrighted to Scranton/Wilkes-Barre, but refused the assignment and elected to become a free agent. Cleveland Indians On January 4, 2010, Duncan signed a contract with the Cleveland Indians. He began the season with the Triple-A Columbus Clippers. The Indians designated Duncan for assignment on August 29, 2012. In 81 games with the club during the 2012 season, he hit .203 with 11 home runs and 31 RBIs. Tampa Bay Rays On January 22, 2013, Duncan signed a minor league deal with the Tampa Bay Rays. He was designated for assignment on April 30, 2013. He declared free agency on October 11. Arizona Diamondbacks On January 24, 2014, Duncan signed a minor league deal with the Arizona Diamondbacks. Cincinnati Reds Duncan signed a minor league deal with the Cincinnati Reds in May 2014. Duncan was released by the Reds on June 18, 2014. Coaching career On January 7, 2015, Duncan was announced as the new manager for the Arizona Diamondbacks Short Season-A Affiliate, Hillsboro Hops of the Northwest League. On February 6, 2017, Duncan was named the manager of the Diamondbacks Class-A Advanced affiliate, Visalia Rawhide. Duncan was the manager of the Diamondbacks AA-Affiliate, the Jackson Generals, for the