Lee turned professional at the start of 2019. He played a number of events on the
European Tour and had early success, finishing 4th in the
Saudi International and tied for 5th in the
ISPS Handa World Super 6 Perth, both events played in February. These were, however, his only top-10 finishes of the season and he finished 117th in the Order of Merit. In October he was tied for 6th in the
Genesis Championship on the
Korean Tour. At the end of the year he was solo 3rd in the
AVJennings NSW Open and then tied for 3rd in the
Australian PGA Championship, an early season event on the
2020 European Tour. In February 2020, Lee won the
ISPS Handa Vic Open, an event co-sanctioned with by the European Tour and the
PGA Tour of Australasia. In July 2021, Lee defeated
Thomas Detry and
Matt Fitzpatrick in a playoff at the
Abrdn Scottish Open. With this win, he earned entry into the
2021 Open Championship. In May 2023, Lee earned special temporary membership on the
PGA Tour. In October 2023, Lee won the
SJM Macao Open on the
Asian Tour. He shot a tournament record of 254 (30-under-par) and won wire-to-wire by two shots ahead of
Poom Saksansin. One month later, Lee won the
Fortinet Australian PGA Championship. On 30 March 2025, Lee earned his first PGA Tour victory by winning the
Texas Children's Houston Open, beating
Gary Woodland and world number one
Scottie Scheffler by one stroke. On 15 February 2026, Lee finished joint runner-up with
Sepp Straka behind
Collin Morikawa at the
AT&T Pebble Beach Pro-Am, marking his best ever finish at a PGA Tour Signature Event. ==Personal life==