.Dave Kearney scored a hat-trick of tries as Leinster recorded a 48-31 victory over Zebre in Parma.
Defending champions France, past winners New Zealand and South Africa, Oceania champions Australia, Six Nations champions Ireland and Wales were victorious on day one of the World Rugby U20 Championship in Argentina.
The 2018 edition of the premier age-grade tournament is predicted to be the most competitive yet and the opening day lived up to that expectation with four matches decided by less than seven points.