Scotland's Ewan Lumsden and English 17-year-old Mia Wainwright emerged victorious at the first Tennis Scotland Open Tour finals to be broadcast live by BBC Scotland.
Lumsden, ranked 601 in the world, avenged last year's defeat in the final by Stewart (520) 7-5 3-6 7-5 to complete a double after having already teamed up with former world number 44 Jonny O'Mara to take the men's doubles title.
Top-seeded reigning champion Stewart had earlier defeated English third seed and fellow 25-year-old Liam Hignett 6-3 6-4 in the semi-finals, while second seed Lumsden swept aside fellow 24-year-old James MacKinlay 6-0 6-1.