That was 19 seconds ahead of second-placed Edinburgh Athletic Club under-15 Dylan Daunt.
Gala Harriers under-15 Archie Dalgliesh was the first Borderer to finish, placing fourth in 10:46.
Two other Borderers made the top ten of the 88 youngsters on the run at the weekend – Lauderdale Limpers under-15 Sam Robertson, seventh in 11:37, and Gala under-13 Seb Darlow, eighth in 11:45.
Edinburgh under-15 Nancy Corrie was first female finisher out of 40, and tenth overall, in 12:16.
Moorfoot Runners under-13 Thea Harris was the first Borders girl back, and 13th altogether, in 12:29.
See also …
1. Sunday's Borders Cross-Country Series junior race at Galashiels
Lasswade's Rowan Taylor won Sunday's Borders Cross-Country Series junior race at Galashiels in a time of 10:18 Photo: Steve Cox
2. Sunday's junior Borders Cross-Country Series race at Galashiels
Gala Harriers under-11 Holly Craig placed 39th in 14:06 in Sunday's junior Borders Cross-Country Series race at Galashiels Photo: Steve Cox
3. Sunday's Borders Cross-Country Series junior race at Galashiels
Teviotdale Harriers under-nine Connor Davidson finished 20th in 12:53 in Sunday's Borders Cross-Country Series junior race at Galashiels Photo: Steve Cox
4. Sunday's junior Borders Cross-Country Series race at Galashiels
Lauderdale Limpers under-13 Cleo Macleod placed 62nd in 16:07 in Sunday's junior Borders Cross-Country Series race at Galashiels Photo: Steve Cox