New Zealand beat Spain in opening match of Glasgow Sevens
James Mortimer 06 May 2012 Getty Images
The final leg is in London next weekend.
Salesi Piutau scored a double, while Ardie Savea, captain DJ Forbes and Tim Mikkelson also crossed for New Zealand.
Cesar Sempere notched a cheeky try for Spain, which led to huge celebrations for the team.
New Zealand play France and Samoa to round out pool play.
Gordon Tietjens troops lead the overall series with 128 competition points, with Fiji close behind on 122.
South Africa (105), England (104), Samoa (101) and Australia (84) lead the chasing pack.
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