Shane Lowry was convinced his game was on the rise, despite his poor scoring. He finally showed that Thursday in the RBC Heritage, shooting a 6-under 65 to take a one-shot lead.

Trey Mullinax, Daniel Berger, Luke List, Ryan Moore and Ryan Palmer were tied for second.

Top-ranked Dustin Johnson, coming off a second-place tie at Masters last week, rallied with two birdies in his final seven holes for a 68, leaving him three shots back.

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