Tennis duo set for tourney at North Berwick
Melville is seeded at No.?3 behind holder Scott Lister (Linlithgow) and first-time entrant Billy McNeil (Aberdour) but just ahead of club-mate, Jimmy Wood.
In the women's singles, Watson is expected to face Zoe Henderson (Dunfermline), her conqueror in a tight under-18 final last year.
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Hide AdDefending champions Gary Melville and Fraser Stirling (Livilands) are clear favourites to retain the men's doubles while the ladies double final could pitch Peebles pair Lisa Campbell and Juliet Smith against Dunfermline's Fiona Reid and Zoe Henderson.
A total entry of almost 350 has been received ranging from under-8s to veterans plus handicap competitions.
An innovation this year will be a round-robin wheelchair event.