Goals from Gareth Bale, Isco and a stunning late strike from Mariano sealed a 3-0 win for Real Madrid against Roma.
The scoreline did not fully reflect the dominance of Real, who had a number of chances to add to their tally.
Isco broke the deadlock in the 45th minute as he brilliantly curled home from a free-kick.
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Bale doubled the tally 13 minutes into the second half as he swept home from a long Luka Modric pass before Mariano (90+2) rifled home a superb effort into the bottom far corner to seal the victory on his second debut for the club.
Roma offered very little in return and Real go top of Group G on goal difference after Viktoria Plzen beat CSKA Moscow 2-1 in the group’s other fixture on Wednesday.