New Zealand has beaten Sri Lanka by 120 runs in the sixth one-day international in Dunedin to take an unbeatable 4-1 lead in the seven-match series.

After winning the toss, New Zealand elected to bat first and made 8 for 315 with Kane Williamson 97 and Ross Taylor 96.

Sri Lanka, in reply, was all out for 195 with Kumar Sangakkara contributing 81.