Byeong Hun An came back down to earth one day after the best round of golf of his professional career.
The 33-year-old South Korean, who spent one season at Cal, shot an 8-under 63 in the third round of the RBC Heritage at Harbor Town Links on Hilton Head Island.
But Sunday brought a 73 as An slid from a share of 16th place to a tie for 38th at 6 under par on the final leaderboard.
Justin Thomas took home a playoff victory over Andrew Novak after both finished 72 holes at 17 under par. They finished three strokes ahead of the field, with world No. 1 and defending champion Scottie Scheffler settling for a tie for eighth at minus-12.
An, still seeking his first victory on the PGA Tour, birdied the second hole Sunday but he double-bogeyed No. 4 and had three more bogeys, including on the 18th.
Still, An fared better than any of his three Cal compatriots.
World No. 4 Collin Morikawa and Michael Kim finished in a tie for 54th place and Max Homa, after an encouraging tie for 12th place at the Masters last week, resumed his year-long woes and finished 70th in a field of 72.
Morikawa, with five birdies and three bogeys, shot a 69 to complete the week at 3 under. Kim likewise had a 69 in the final round, the result of four birdies and two bogeys.
Homa had double bogeys on the first and fifth hole, never recovered and wound up with a final-round 75.
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