The course record at Detroit Golf Club was threatened, tied and then finally toppled on Thursday at the Rocket Classic.

After budding Australian star Min Woo Lee carded a 9-under-par 63 to match the course record, it came down when Aldrich Potgieter of South Africa wrapped up a 10-under 62.

Just minutes after Potgieter's round was complete, Kevin Roy also signed for a 62. They carry a one-shot lead in the tournament into Friday.

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By day's end, the old record looked like child's play, as Mark Hubbard and Max Greyserman also finished up with 63.

Potgieter got off to a white-hot start, shooting a 7-under 29 on the back nine with five birdies and an eagle. He added birdies at Nos 1, 7 and 8 and nearly made it a 61 with another birdie at No 9 that missed by inches.

"I (thought it was going in), I started walking after it," Potgieter said. "But it was a good putt, I'm happy with it. And it was on a crest so I didn't know if it was going to be left or right, so it was just a little unfortunate but I'll take the 62 still."

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Roy finished his round eagle-birdie to match Potgieter's number. Roy chipped in for eagle from 30 feet at the par-5 17th hole and then stuck his approach at No. 18 to about 5 feet to set up his final birdie.

"Just one of those days everything was clicking," Roy said. "Lot of fairways, lot of greens, putter got hot, bonus chip-in on 17 for eagle. It's just when you've got it going, it's a lot of fun to try to keep it going. Yeah, just really happy with it."