[2] An moved to the United States in December 2005 to attend the David Leadbetter Golf Academy in Bradenton, Florida, where he was also known as Ben An.

Amateur when he defeated Ben Martin 7 & 5 in the 36-hole final at Southern Hills Country Club in Tulsa, Oklahoma.

[4] He made his PGA Tour debut in March 2010 at the Arnold Palmer Invitational, two weeks before playing in The Masters.

In December 2019, An played on the International team at the 2019 Presidents Cup at Royal Melbourne Golf Club in Australia.

He tested positive for a substance banned by the World Anti-Doping Agency that was included in an over-the-counter cough medicine in South Korea.