Ben Griffin, warming up for his Ryder Cup debut, fired a two-under par 70 on Saturday to stay atop the leaderboard at the PGA Procore Championship, with amateur Jackson Koivun and top-ranked Scottie Scheffler in pursuit.With a 54-hole total of 16-under 200 he was still one stroke ahead of world amateur number one Koivun after firing three birdies in a two-under par 70 at the Silverado Resort in Napa, California.
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