Shane Lowry produced a superb round of 63 to power his way to the top of the leaderboard at the Cognizant Classic at Palm Beach Gardens.
Lowry started the day six shots off a lead held by Austin Smotherman, but quickly set about reducing that deficit as he birdied the first, fourth, fifth, eighth and ninth holes to make the turn at five-under-par.
Another birdie followed on the 10th, and he picked up two more shots on the final two holes on a blemish-free round that moves him to 13-under.
The 2019 Open winner sits at the top of the standings alongside Smotherman, who carded a 69, and one clear of Colombia's Nico Echavarria.
"I holed a few nice putts at the start," said Lowry. "Then I started hitting the ball really well and giving myself lots of chances and converted a few and I felt like it was just a really nice solid round of golf.
"Birdieing the last two was kind of the icing on the cake."
Séamus Power carded his worst round of the tournament with a 73 that sees him 11 shots behind Lowry and in a tie for 38th.
The Waterford native opened with successive bogeys and was three over at the turn.
It was a steadier back nine, a birdie at 10 given back at the 13th, but the 38-year-old finished well with a superb approach shot allowing him to successfully land a seven-foot putt for birdie.
