On Saturday the local team beat Estonians 3-2 after a tense struggle which had seen them go two sets behind early on.
Riga took the third set 15-10 and the fourth 16-15, and after being 10-2 down in the decider they came back from an apparently impossible position to win 15-11.
Riga welcomed back John Clarke for Sunday's encounter with Roundwood. and they swept the Londoners aside to win by three sets to nil.
The victories mean that Riga are joint league leaders with Sefton (Liverpool). and the two teams clash on November 29.
