OWINGS MILLS, Md.—The opportunity was there, and the putts didn’t fall. This wasn’t Bryson DeChambeau trying to break 60, but Jon Rahm trying to take the lead Saturday morning at the BMW Championship. Rahm completed the storm-delayed second round at Caves Valley by narrowly missing birdie chances from 15 feet and 10 feet, and then he three-putted from long range on the 18th hole for a 66 that left him two shots behind. DeChambeau had a shot at tying the PGA Tour record at best—and having the 13th sub–60 round on the PGA Tour at worst—until missing putts from 15-feet and 6-feet over his final two holes Friday. He had to settle for a 60 and a one-shot lead over Patrick Cantlay. The second round featured a 90-minute delay because of storms in the area. Rahm was the only player who could have caught DeChambeau at the halfway point. DeChambeau …