Taiwan player claims Cameron Corbett Vase
The 19-year-old from Taiwan, who is an overseas member of the East Lothian club, edged out Royal Aberdeen's Scott Larkin at the second extra-hole after both players had finished locked at the head of the leaderboard with one-under aggregates of 215.
The scheduled four rounds were cut to three due to heavy rain and strong winds and Hsu closed with a level-par 72 while Larkin hit a 71 to tie for top spot.
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Hide AdUS college student Hsu claimed the victory in the play-off with a birdie-four on the par-five 18th while Larkin three-putted for a five.
Greg Nicholson, Scott Crichton, Jamie MacKay and former Scottish Boys' champion James White finished in a share of third on 217.