Xiong was born in Guam to Hmong parents. He moved to San Diego, California when he was six with his mother, Jing, and uncle, James Xiong.[2] He participated in the Pro Kids | First Tee Program in San Diego. His uncle served as his golf coach from an early age.
He left high school early to attend Oregon beginning in January 2017. In his first semester he won the Phil Mickelson Award as the nation's top freshman.[4] Xiong won the Western Amateur in August by defeating Doc Redman, who would win the U.S. Amateur, after 22 holes.[5]
At the 2017 U.S. Amateur, Xiong finished second in qualifying after shooting a round of 64, but was defeated in the opening round of match-play.[6] He was selected for the American team at the 2017 Walker Cup, compiling a record of 3–0–1 as the Americans won the cup.[7]
In 2018 he won the Jack Nicklaus Award as the Division I men's golfer of the year.[8] He also received the Haskins Award as the most outstanding collegiate golfer.[9]
Xiong's amateur success led his coach at Oregon, Casey Martin, to compare him to Tiger Woods at the same age.[10]
Professional career
Xiong announced he was turning professional in May 2018.[11] He made his professional debut at U.S. Open sectional qualifying on June 4.
On December 9, Xiong finished second in Korn Ferry Tour qualifying to earn his card for 2019.[12] He made just five cuts in 21 events in his rookie season and lost his KFT status after shooting 81 in the first round of Q-School.[13]
In July 2021, Xiong was a Monday qualifier for the 3M Open, his first start on the PGA Tour in more than two years.[14]
In June 2022, Xiong won the Korn Ferry Tour's Wichita Open after Monday qualifying, giving him full status on that tour.[15] A win the following year at the Nationwide Children's Hospital Championship ensured he would earn a PGA Tour card for the 2024 season.[16]