November 21-24
Sea Island Resort (Seaside), Sea Island, Georgia
$6,600,000
Round 1. Round 3, Round 4

A "slam-dunk" eagle helped Tyler Duncan storm into the lead at the halfway stage of the RSM Classic.

The American's nine-under par 61 featured a two at the par-four eighth at Sea Island's Seaside course when his 106-yard approach hit the flag and rattled straight into the cup.

He had already made four birdies, and another three on the back nine saw him into a two-shot lead heading into the weekend.

Webb Simpson could not follow up his opening 65 and dropped down to a tie for 11th after he could only manage an inconsistent 68, featuring six birdies and four bogeys.

There was a three-way tie for second place behind Duncan, with Colombian Sebastian Munoz, Rhein Gibson of Australia and local favourite DJ Trahan all on 12 under.

Trahan matched Duncan's nine-under-par score for the day with a 63 on the par-72 Plantation course, while Munoz also shot 63 but on the par-70 Seaside course.