Lee is now at Caves Valley Golf Club for the BMW Championship.
He teed off with Sergio Garcia and Erik Van Rooyen at 7.07 GMT and shot -1 71 to lie in T47th place.
In the second round, he bogeyed the 1st then birdied 2,4,6,11,12 and 15 then made double-bogey at 17 before play was suspended due to inclement weather. He shot a bogey at the last to finish with a 70, now 3 under par.
In the third round Lee made 7 birdies and a double bogey at the 12th finishing in T22nd place on 67, now 8-under for the event,
He played alongside Charlie Hoffman for the final round at 4.27 GMT and shot 3 under 69. He finshed 11 under for the tournament in T34th place.
The match was decided in a play-off between De Chambeau and Cantley who both scored 27 under. It was at the 6th hole that Cantley won the title with a birdie shot.