Simon Skillicorn won Saturday's Glen Mona Horse shoe by over four minutes.
Tom Cringle, who is his nearest rival in the league this year, was second, and Ian Gale was third.
Cal Partington claimed the women's race ahead of last year's winner Rose Hooton. Bridget Kaneen was third.
LIVE: 2026 Commonwealth Games
Live coverage from Glasgow from 23 July to 2 August
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Competition takes place in Valencia this weekend
CWG Bowls: Victory for Isle of Man on first day in Glasgow
Mark McGreal wins in the Men's Singles.
Bowls squad proud to fly the Manx flag in Glasgow
Four local players taking on 2026 Commonwealth Games