(CNN) A stunning South Africa comeback prevented Fiji from claiming back-to-back World Rugby Sevens Series triumphs in Singapore Sunday.

Nineteen points down at halftime in the gold medal match, the Blitzboks rolled off three tries and a late penalty to secure a remarkable 20-19 turnaround victory.

South Africa head coach Neil Powell said he was "thrilled" with the fightback which was "reward" for the effort his players put in over the weekend.

"Going into the finals is always going to be difficult. It's natural to have a bit of doubt and disbelief," Powell said.

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