Holders Real Madrid gave their hopes of winnin four Champions League titles in five years the perfect start with victory over APOEL Nicosia at the Bernabeu.
Cristiano Ronaldo scored twice, with Sergio Ramos firing home an overhead kick to complete the win.
It sees the Spaniards top Group H on goal difference with Tottenham defeating Borussia Dortmund 3-1 at Wembley Stadium.
Relive the action in our scoreboard blog below...
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How to watch
The Bernabeu match will be shown live on BT Sports Extra 2 tonight, with coverage from 19:30 BST.
Real Madrid XI: Navas; Carvajal, Ramos, Nacho, Marcelo; Casemiro; Kovacic, Modric; Isco; Bale, Ronaldo
Subs: Casilla, Varane, Kroos, Theo, Lucas, Mayoral, Ceballos
APOEL XI: Waterman, Vourous, Rueda, Carlao, Lago, Morais, Vinicius, Ebecilio, Sallai, Aloneftis, De Camargo
Subs: Gudino, Alexandrou, Merkis, Farais, Zahid, Pote, Antoniou
Real start quest for La Decimotercera
Europe's dominant Champions League force remain intent on flexing their continental supremacy still further, by targeting a 13th title.
Real enter this term's competition as back-to-back winners, further underscoring their hold on the top accolade.
Real spent 12 lean years labouring to their 10th Champions League win, long dubbed La Decima and so craved by supporters.
But with that monkey long since off their backs, Real expect to keep racking up the titles.
And the Spanish press have already branded this year's Champions League assault as La Decimotercera, the 13th.
Ronaldo to the rescue for Real
Real have struggled in front of goal in grinding to two draws in three matches of a below-par opening to the new La Liga season.
To add to those concerns striker Karim Benzema suffered a hamstring injury in the weekend's 1-1 draw with Levante.
Cristiano Ronaldo is currently serving a five-match ban for pushing the referee after being sent off in Real's Spanish Super Cup clash with Barcelona.
That ban does not extend to the Champions League however, so Ronaldo's presence provides a timely boost to boss Zinedine Zidane's resources.
Can APOEL spring a shock?
Real thumped APOEL 8-2 in the 2011/12 quarter-finals, so the Cypriot visitors know the full might of their hosts on Wednesday.
APOEL striker Mickael Pote summed up the magnitude of the trip by telling a press conference: "Playing at the Bernabeu will be a dream come true.
"We will definitely enjoy the occasion but we want to disturb them. Now whether or not we can do that remains to be seen."
What formation will Zidane choose?
Benzema's injury leaves Real boss Zidane weighing his options in terms of attacking set-up. A straight 4-4-2 would allow Real to pair the returning Ronaldo and Gareth Bale up front.
A 4-3-3 could suit Bale's needs, while the 4-4-2 option might allow more opportunities for Isco.
Zidane told a press conference on Tuesday "we might go with something new" given Benzema's injury.
Whatever the boss has up his sleeve, Real will definitely be hunting goals and a return to top form.
How will APOEL cope without Efrem?
Cyprus winger Georgios Efrem remains sidelined with shoulder trouble, and will be a real miss for APOEL.
New recruit Roland Sallai impressed on his league debut however, and could slot in as the visitors bid to offset the loss of one of their top talents.
Additional reporting by the Associated Press and the Press Association.