Dustin Johnson, known for length off the tee, showed off his precise ball-positioning and hot putter Saturday to take the RBC Heritage lead. Johnson shot a 3-under 68 for a one-shot lead over Shane Lowry, Ian Poulter and Rory Sabbatini. The top-ranked Johnson, a South Carolina native who had not played his home state's only PGA Tour stop for nine years before returning in 2018, seems to have found a home on Harbour Town Golf Links' narrow fairways and smallish greens.