Fiji will earn their first Olympic medal in what is their 14th summer Games in rugby sevens and the pre-tournament favourites are going for gold against Great Britain.
A 20-5 victory over surprise packages Japan in the semi-finals secured a place in history for the island nation.
Japan had shocked New Zealand in the group stage before eliminating France in the quarter-finals, but Fiji proved an obstacle too far.
Japan's Teruya Goto cancelled out Vatemo Ravouvou's early score in an even first period, but Fiji ran away with it in the second half, running home three unanswered tries.
London-born Fiji coach Ben Ryan will come up against his compatriots in the gold medal match after Team GB edged out South Africa 7-5.
Tom Mitchell's conversion after a Dan Norton try proved crucial for GB in a gritty contest against the Blitzboks, who now face Japan for the bronze medal.