France pulled away Italy in Paris to open their campaign with a 37-10 bonus-point win.
The Azzurri briefly threatened to derail France’s attempt at a first title since 2010 when debutant teenager Tommaso Menoncello scored.
But Anthony Jelonch and Gabin Villiere crossed to put the hosts in front.
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In the second half, Villiere completed his hat-trick and Damian Penaud also crossed to secure the bonus point.
France top the table after round one from second-placed Ireland on points difference, with Andy Farrell’s side travelling to Paris in round two.
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