Japan made it three wins out of three in the women's Athens Olympic final qualifying tournament after cruising past Nigeria 3-0 on Tuesday.
Roared on by a home crowd of nearly 10,000 at Tokyo Metropolitan Gymnasium, Japan set about its opponent from the outset and needed just 77 minutes to destroy the Africans 25-10, 25-9, 25-19 to improve its chances of qualifying for Greece after going top of the eight-team group.
In other matches, South Korea also maintained its unbeaten record after coming from behind to beat Russia 3-2. Russia stayed third ahead of Italy, which whipped Puerto Rico 3-0.