Green reportedly hadn't been feeling well for the last few days and later received an IV, according to the PGA Tour's website.
Matt Kuchar knew he was in trouble when his tee shot sailed so far to the right that he hit a provisional in case the ball was out-of-bounds.
Kuchar missed just two of 14 fairways on his way to his lowest opening round on tour since a 64 in the 2017 Phoenix Open.
"I was able to come back with a couple of birdies and I felt like I was in control".
What put Kuchar in good shape were the five straight birdies on the front nine, and then he took the lead for the first time with a birdie on No. 11 before his wild adventure on the 12th hole.
But Champ, who is seeking his second victory in three weeks, was even better Friday, firing a 9-under 62 despite bogeying the final hole.
"Yesterday was kind of a bogey-free day and just easy, and everything else today was about the same", he said.
"It's not a bomber's course", Champ said. It just had that one challenging hole.
Jordan Spieth was not among them.
Hickock, a buddy of three-time major victor Jordan Spieth, is playing in just his eighth PGA Tour event and his fourth this season after spending past year on the developmental Web.com tour, where he won the DAP Championship and had five other top-10 finishes. Spieth managed only eight birdies in good scoring conditions and will have the weekend off for the seventh time this year.
Kuchar, meanwhile, has more than Champ to worry about the next two rounds.
New Zealand golfer Danny Lee has enjoyed another fine round at the PGA Tour's Mayakoba Golf Classic in Mexico, to be tied for third at the halfway point.
Garcia dominant on day 1 at Nedbank: SUN CITY, South Africa - Sergio Garcia flew into a four-shot lead at the Nedbank Golf Challenge after an 8-under 64 secured the biggest first-round advantage on the European Tour for a year.