NAPA, Calif. — Ben Griffin went about his business Friday like he was at any other PGA Tour stop, even with so many Ryder Cup teammates around him. He played bogey-free for the second straight day with a 6-under 66 to build a three-shot lead in the Procore Championship.
Two “cup” players were behind him — one of them fellow Ryder Cup rookie Russell Henley (68), the other Jackson Koivun, the top-ranked amateur who went 3-1 last week at Cypress Point to help lead the Americans to a Walker Cup victory.
Koivun hit a 3-iron to 30 inches for eagle on the par-5 12th, hit a tee shot out-of-bounds on the 14th and salvaged a bogey, bounced back with a birdie and wound up with a 66…