Somdev Devvarman won again as India strolled to a 4-0 lead against Indonesia in the Asia/Oceania Group 1 play-off Davis cup tie.India's top singles player thrashed David Agung Susanto in straight sets 6-3, 6-1 in the first reserves singles to extend his home country's lead.India had already retained their place in Asia Oceania Group-I, after they took a 3-0 lead yesterday after Leander Paes and Sanam Singh registered an easy 6-2, 6-1, 6-4 victory against the Indonesian pair of David Agung Susant and Elbert Sie.