Jonathan James Scheyer (Hebrew: ג'ון שייר; born August 24, 1987) is an American-Israeli former basketball player, currently an associate head coach of the Duke Blue Devils men's basketball team. Scheyer led his high school team to an Illinois state basketball championship as a high school All-American, and was one of the starters on the 2009–10 Duke Blue Devils that won the 2010 NCAA Basketball Championship, as a college All-American. He was a prolific high school scorer, and later an Atlantic Coast Conference (ACC) leader in numerous statistical categories, ranging from free throw percentage and three point shots/game to assists/turnover ratio.
In high school, he once scored 21 points in a game's final 75 seconds of play in an attempt to spark a comeback. The 4th-leading scorer in Illinois high school history, he led his team to a state championship in 2005, and was named Illinois Mr. Basketball in 2006. Also in 2006, Scheyer was voted as one of the 100 Legends of the IHSA Boys Basketball Tournament, a group of former players and coaches in honor of the 100 anniversary of the IHSA boys basketball tournament.
He chose to attend Duke for college, for whom he moved from shooting guard to point guard towards the end of the 2008–09 season, and was the Most Valuable Player (MVP) of the 2009 ACC Men's Basketball Tournament. In his senior year in 2009–10 as Duke's captain, he led the team to ACC regular season and Tournament championships, and to the NCAA National Championship. He led the championship team in points per game, assists, free throw percentage, and steals per game. Scheyer was a 2010 consensus All-American (Second Team), a unanimous 2009–10 All-ACC First Team selection, and was named to the 2010 ACC All-Tournament First Team.He played the most consecutive games in Duke history (144), shot the third-highest free throw percentage (.861), shot the third-most free throws (608), shot the fourth-most 3-pointers (297), and is ranked ninth in scoring (2,077 points). He holds the ACC single-season record for minutes (1,470; in 2009–10) and the Duke freshman free throw record (115), shares the Duke record for points off the bench in a game (27), and had the third-longest streak of consecutive free throws in Duke history (40). He was not drafted in the 2010 NBA Draft, but played for the 2010 Miami Heat Las Vegas summer league team; however, playing for the team in July he was poked in the eye by Golden State's Joe Ingles and suffered a serious, life-changing right eye injury in which his eye's optic nerve was injured, and he suffered a tear in its retina, which was re-attached surgically. He was a 2010 Los Angeles Clippers training camp invitee, but was waived in the team's reduction to its final roster. In 2011, he played shooting guard for the Rio Grande Valley Vipers of the NBA D-League.