France, who lost wing Vincent Rattez through injury, were always in control having beaten England 24-17 in a spectacular opener, but they will need to up their game again when they visit defending champions Wales in two weeks' time.
First-half tries by Virimi Vakatawa and man-of-the-match Alivereti Raka were enough to secure the win for Les Bleus against a spirited Tongan side that competed throughout a tense encounter at the Kumamoto Stadium.
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