UNHERALDED South Korean golfer Si Woo Kim has become the youngest winner of the Players Championship, obliterating the mark previously held by Australia's Adam Scott.
The 21-year-old Kim fired a bogey-free final round of three-under-par 69 at TPC Sawgrass to finish at 10-under, claiming a three-shot victory over England's Ian Poulter (71) and South Africa's Louis Oosthuizen (73) at golf's unofficial fifth major championship.
Spain's Rafael Cabrera-Bello (70) shared fourth place at six under with American Kyle Stanley (75).
Kim secures a $US1.89 million winner's pay cheque and a five-year exemption on the US PGA Tour.
Scott was the previous youngest winner in the US PGA Tour's flagship event in 2004, when he won aged 23 years, 8 months, and 12 days, while Kim doesn't celebrate his 22nd birthday until June 28.
Earlier, 36-year-old Scott made a late move up the leaderboard with a back-nine charge.
After dropping two shots during his first nine holes, world No.11 Scott rallied with four birdies on the back side to sign for a two-under-par 70 and finished in a tie for sixth, his fourth top-10 result at the event.
Australia's world No.3 Jason Day claimed an unwanted record for the worst-ever final round by a defending champion since the Players moved to TPC Sawgrass in 1982, signing for an 80.
Day, who has romped to a four-shot victory in 2016, finished at seven-over for the tournament.
His horror Sunday began with a two-over score through his first nine holes before a disastrous quadruple-bogey nine at the par-5 16th and a double-bogey 5 at the famous par-3 17th pushed him to eight over for the round.
Aaron Baddeley (three-over) and Rod Pampling (four-over) both shot 72.
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