American Jake Knapp carded the 15th sub-60 round in PGA Tour history on Thursday with a 59 in the first round of the Congnizant Classic at Palm Beach Gardens in Florida.
The 30-year-old poured in 12 birdies in his bogey-free round at PGA National, making a 20-foot putt on the last green to join the small club of players to break 60 on tour.
Knapp started with five consecutive birdies before a birdie on the ninth saw him play the outward half in six-under 30.
Five more birdies in the first six holes of the back nine set up a chance for a 59, which he took on the par-five 18th.
Former US Open champion Jim Furyk holds the record for the lowest ever PGA Tour round with a 58 at the 2016 Travelers Championship.
Knapp won his first ever PGA Tour title at the Mexico Open last February.
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