Watt was in the mix after Rounds 1 and 2, but trailed leader Tom Bond by three shots. His third-round 66 and final-round 71 kept him at the top of the leaderboard for a 73-67-66-71--277 victory.

Watt was four shots ahead of Tom Power-Horan, who fired rounds of 69-74-68-70-281.

Geoff Drakeford was third at 72-71-70-69--282.

In the women's division, Su-Hyun Oh upended midway leader Min Jee Lee by three shots. Oh fired shot rounds of 71-71-69-66--277 while Lee ended the event 70-72-71-67--280.

Dottie Ardina was third at 77-65-76-75--293.

The Dunes Medal is an Open Amateur event played over 72 Holes on The Dunes Golf Links championship course.

Rounds 1 and 2 were played on Tuesday and Wednesday followed by a cut with the Top 40 players plus ties playing the final two rounds on Thursday and Friday along with all members of The National Squad.