David Shelley Duncan (born September 29, 1979) is an American former professional baseball player. He was a left fielder, designated hitter, and first baseman. Duncan played in Major League Baseball (MLB) for the New York Yankees, Cleveland Indians, and Tampa Bay Rays. He was the Major League field coordinator for the Toronto Blue Jays, and later served as the analytics coordinator for the Chicago White Sox. Personal life Duncan is the oldest son of Dave Duncan, an MLB catcher and pitching coach. His younger brother, Chris, was also an MLB first baseman and outfielder. As of 2018 Shelley married Kirsten Duncan. They both live in Arizona. Baseball career High school Shelley graduated from Canyon del Oro High School, located in the Tucson suburb of Oro Valley, in 1998. While there he was a teammate of former All Star second baseman Ian Kinsler. He played on the school's 1997 baseball team that went on to capture the 5A State Championship title. College career In 1999 he was a Freshman First Team All-American outfielder while attending the University of Arizona. In 2001, he was named First Team College All-American outfielder and Pacific-10 Conference All-Star. He was selected by the Yankees in the second round of the 2001 Major League Baseball draft, 62nd overall. Professional career New York Yankees Duncan's slugging percentage was .410 with the Staten Island Yankees in 2001. He played outfield for the Greensboro Bats in 2002, where he had a .375 on-base percentage and 10 assists from the outfield in 69 games. Playing with the Tampa Yankees of the Florida State League in 2004, Duncan hit 19 home runs in 424 at bats. With the Trenton Thunder in 2005, he hit a league-leading 34 home runs and had 92 RBIs. He was named an Eastern League (AA) mid-season and post-season All-Star first baseman. He was also the winner of the 2005 Eastern League All-Star Game Home Run Derby. In 2006, he hit 19 home runs for Trenton in 351 at bats, and was twice the league's player of the week. In 2007, Duncan was a member of the International League All-Star Team, and was the Topps IL Player of the Month in May while playing for the Triple-A Scranton/Wilkes-Barre Yankees. While with the Yankees AAA team, Duncan had 25 home runs, second in the International League at the time he was called up, and hit .295 with a .577