Magical Fiji edged out reigning Series champions South Africa 24-17 in a pulsating final for their leg win this season.
Fiji has knocked New Zealand out of the Hamilton sevens.
Fiji were on the back foot 30 seconds into the game when Josua Vakurunabili was yellow carded and during his absence Kwagga Smith scored the opening try for South Africa.
Speedster Eroni Sau is on fifth place with 151 points.
They had been trailing 12-5 after first-half Luciano Gonzalez and Felipe del Mestre tries handed a valiant Argentinian side the ascendancy.
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Last year's second-placed side have yet to hit the form that took them close to a maiden title, with this weekend in Hamilton continuing the disappointing start to the campaign.
It's the 2016 Olympic gold-medallists' first World Sevens Series event triumph of the season, and their first win on Kiwi soil since 2010.
FIJIAN rugby trademark off-loads hit global limelight again yesterday when Fiji Airways Fiji 7s reps, Kalione Nasoko and Alosio Naduva combined twice to score the winning tries for Fiji in the Cup final of the Hamilton 7s in New Zealand last night.
A superb second half performance saw the Fijian team storm back, with Alasio Sovita Naduva finishing the match with a hat-trick of tries, helping his team to a dramatic 24-17 win.
"It's been a tough two weeks for us as a programme losing out in the quarter-final stages - we aspire to be better than that", said the head coach.
How major U.S. stock indexes fared on Wednesday
But Hong Kong's Hang Seng index dipped 0.1 percent to 32,843.20 and China's Shanghai Composite Index lost 0.9 percent to 3,449.93. Eight of the 11 major S&P indexes were lower, with the materials index's 1.21 percent fall leading the decliners.
Elsewhere, Australia edged past New Zealand 8-7 to take the third-place honors, while United States of America saw off Argentina 31-12 to lift the Challenge trophy.
Wales scored another two tries in the second half to just the one from Russian Federation to win 33-7 in the end.
Focus now shifts to next month's (March 2-4) fifth round in Las Vegas, USA, followed by the Vancouver Sevens (March 10-11) in Canada.
Australia then kicked a penalty in the third minute of injury time to beat 8-7 in the playoff for third place. "We were good in the contact area, the tackle and then we finished with lovely tries".
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