In Sunday's cup final, Fiji defeated Kenya 31-12 to close in on top spot in the standings while South Africa saw off the United States 29-7 in the bronze medal game to be eight points clear at the top with four rounds remaining.
Fiji had nearly no possession in the first half - making only four passes to Kenya's 20 - but managed two breakaway tries from kickoffs to keep the match in the balance at halftime.
Kenya had to dig deep after falling 19-12 in the second half with less than two minutes to go.
Fiji had it well in hand when Ambaka went flying down the left wing apparently set to give Kenya a final try only for Tuwai to wrap him up. "All the teams now are very hard to play against, not like before".
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Skipper Oscar Ouma landed a last minute try as Kenya shocked the United States 24-19 to reach the main Cup final at Canada Sevens at BC Place, Vancouver on Monday morning.
In the final, Kenya started off well with Willy Ambaka creating time and space to surge over the line for a try.
However, seconds later, Fiji were on level thanks to Josua Vakurunabili try. Samuel Oliech swept over to put Kenya back in front.
Mocenacagi clinched the Man of the Match award when he scored again two minutes into the second half, supporting Amenoni Nasisila, who handled twice in the build-up.
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Their reward is a quarterfinal match up against world series leaders South Africa, who suffered a loss to second-ranked New Zealand to finish second in their pool.
South Africa lead by 109.
Fiji came back in the second half looking much better and scored three more tries to all but seal their second title of the season and move to the second place in the IRB rankings with 101 points, eight points behind South Africa.
The series now heads to Hong Kong for the seventh round April 6-8.
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