Day, who could leapfrog Rory McIlroy and Jordan Spieth to reach the top of the rankings with victory this week, produced sizzling form as he moved to 10 under par after 17 holes before play was suspended for the day due to the threat of lightning.

That left the Australian world number three a commanding four strokes ahead of American Daniel Berger, who eagled his final hole, the par-four ninth, for a six-under 65 in breezy conditions at Conway Farms Golf Club.

Day had just hit his tee shot 346 yards into the right rough at the ninth, his final hole, before the siren sounded to halt the action and he faces a second shot from 44 yards for what would be a sensational eagle.

Should he hole out from there when he returns to the course on Friday morning to complete his round, he would become only the seventh player on the PGA Tour to shoot a 59.

"If it goes in, it goes in," said Day. "Right now I'm just trying to play the best I can. I'm just trying to get off to a good start.

"I feel like this is one of the best rounds I've ever played, especially with how the wind is.

"Just the way I'm playing, hitting the greens and putting and just how everything is kind of going, hitting it long and straight ... it's a good thing for success out there."

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