Crocker earned his first U.S. Open start by posting 11-under 131 in final qualifying at River Oaks and Lakewood country clubs in Dallas, Texas. The native of Zimbabwe has mostly toiled on the European (now DP World Tour) and European Challenge tours. While he doesn't have a win, he did post three third-place finishes on the European Challenge Tour in 2018. Crocker's father, Gary, was on the Zimbabwe national cricket team, but the family had to flee the country when Sean was 5 due to political issues. His family eventually settled in California and Sean went on to earn a golf scholarship to the University of Southern California after transitionng from football and basebal. He was the stroke-play medalist in the 2014 U.S. Junior Amateur, losing in the quarterfinals to eventual champion Will Zalatoris. He also advanced to the semifinals of the 2015 U.S. Amateur, losing to Bryson DeChambeau, the eventual champion. Crocker's father is a good friend of major champion and current USGA Executive Committee member Nick Price, and the World Golf Hall of Famer has been a mentor to Sean.