Lobban, who took a break from the sport earlier this year, took the first two games against Canada's Tyler Osborne, but then started to struggle. He saved two match points in the fifth before losing 11-4, 11-9, 8-11, 1-11, 11-13.
For Osborne, the No.?5 seed, it was the perfect preparation for next week's British Junior Open in Sheffield. "That was a very hard match," admitted the 17-year-old from Ontario. "Greg made everything in the first two games but then I think he got a little tired and started missing by a fraction of an inch. There wasn't really much between us, but it is great to win."
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Hide AdLobban's younger sister, Kirsty, scored a rare Scottish victory in the girls' under-15 Championship last year but lost in the semi-finals this time.
In the boys' under-15 event, Crieff's Rory Stewart was runner-up, losing the final 7-11, 8-11, 6-11, to top seed Ziad Roshdy from Egypt.