Matheson, who also won his age group race at the recent Great Edinburgh International in Holyrood Park, covered the course in 18 minutes 34 seconds to finish fully 20sec clear of his nearest challenger Josh Grace (Aldershot).
Another athlete with Lasswade connections, Guy Learmonth, smashed his personal best (PB) with a terrific front run to win the senior 800 metres for the East in 1:51.29 in the Scottish Inter-Regional Indoor Championships at the Kelvin Hall at the weekend.
Former New Year Sprint winner Pat Swan (Edinburgh AC) was another to storm home in the 400m in 48.69 while Allan Hamilton (EAC) took the long jump with a personal best of 7.05m.
Emma Nuttall (EAC) won the high jump with a PB of 1.73m.
In the Scottish age group Championships there was an upset victory for John Glen (EAC) in the under-15 200m over clubmate Kieran Kivlin; while Kyle Hogg (EAC) won the under-15 60m in 7.46 and clubmate Tom Holligan took the under-17 race in 7.29.