David Lemi scored two tries as Samoa stayed unbeaten in the Pacific Nations Cup with a 29-26 win over Fiji, while Tonga won 24-20 to inflict a second loss on defending champion Japan in the second round.
Samoa followed its 20-18 first-up win over Tonga with an impressive win against Fiji to top the standings in the four-nation competition.
Both teams scored three tries, but flyhalf Ki Anufe led Samoa to victory by contributing 14 points from a conversion and four penalties.
Tonga outscored Japan three tries-to-two to post its first win of the tournament following an outstanding individual performance from Japan fullback Ayumi Goromaru, who scored a try in his match total of 15 points.
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