Real Madrid made it six points from two games in Group B as doubles from Cristiano Ronaldo and Angel di Maria guided them to a 4-0 win over FC Copenhagen.
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Following his hat-trick in the 6-1 thrashing of Galatasaray in matchday one, Ronaldo now has five goals in just two Champions League games this season
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The Portuguese headed home the opener midway through the first-half from Marcelo's fine cross and made the game safe 25 minutes from time with another headed effort from Di Maria's cross.
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The Argentine winger made it 3-0 himself with a sensational curling effort from 25 yards and rounded off the scoring in stoppage time with another precide left-footed finish.
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A 2-2 draw between Juventus and Galatasaray in the night's other game in Group B leaves Madrid well on course for the last-16, four points ahead of Juve with the Italians set to visit the Spanish capital next time out.
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With Gareth Bale sidelined due to a thigh strain, Real boss Carlo Ancelotti had reacted to Saturday's 1-0 derby defeat to Atletico Madrid by making five changes.
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Iker Casillas returned in goal for the first time in nearly nine months at the Bernabeu, whilst Raphael Varane and Marcelo also made their first appearances since recovering from injury.