Qualified for his first U.S. Open via a 7-for-4 playoff in the Surrey, England, sectional at Walton Heath Golf Club. Shot rounds of 67-68 on the Old and New Courses for a 9-under total of 135. The Irishman held a share of the 54-hole lead in the Open Championship at St. Andrews in 2015 before settling for a tie for 30th. Two months later, he helped Great Britain and Ireland reclaim the Walker Cup at Royal Lytham & St. Annes. Dunne played collegiate golf at the University of Alabama-Birmingham, the same school that produced 2010 U.S. Open champion Graeme McDowell. He was the 2014 Conference USA Player of the Year and he finished fifth in the NCAA Championships as a senior in 2015. He also represented Europe in the 2014 Palmer Cup. He turned pro in the fall of 2015, and is still seeking his first win. He lost a playoff to 2005 U.S. Amateur champion Edoardo Molinari in this year's Trophee Hassan II.