The All Blacks Sevens sit on 151 series points with South Africa in second place on 122. With 22 points up for grabs for winning a tournament it means New Zealand have locked up the series title heading to the final event in London.
New Zealand progressed to the final after a 26-14 win over Wales, setting up a third final against South Africa this year following defeats in USA and Japan.
New Zealand were in line to end that run after heading into halftime with a 14-7 lead following first half tries to Lote Raikabula and Kurt Baker. However South Africa scored three unanswered tries to take win their second Glasgow title in three years.
Meanwhile Ben Lam and Scott Curry have been ruled out of London Sevens after sustaining injuries in Glasgow. Curry broke a bone in his hand while Lam suffered a suspected broken bone in his foot.
Matt Faddes and Warwick Lahmert have both been called into the squad for the final leg in London.