Naples, Italy - Captain Sergio Ramos and Alvaro Morata struck one apiece as 11-time winner Real Madrid secured a seventh successive Champions League quarter-final berth with a clinical 3-1 win over Napoli on Tuesday.
Madrid - which took a commanding 3-1 first-leg lead at the Santiago Bernabeu last month - looked to be facing a tough night in Naples after Dries Mertens finished off a great attacking move to give the host a 24th-minute lead.
But Napoli manager Maurizio Sarri had warned of the threat from the "world's richest club with the best players" a day earlier.
And Zinedine Zidane's Galacticos emerged from the half-time interval in far more clinical fashion.
Ramos rose to head Los Blancos level six minutes after the restart, and a second header which deflected off Mertens at Pepe Reina's near post gave the Spanish outfit a 2-1 lead by the 57th minute.
Napoli saw late claims for a penalty waved away when Mertens tumbled in the box and suffered more woe in the first minute of added-on time when ex-Juventus striker Morata came off the bench to hit Madrid's third for a 6-2 aggregate score.
Napoli required nothing short of a miracle if it was to reach the last eight for the first time - although a bright opening reflected a growing belief in the football-mad southern city the Azzurri could cause an upset.
Maurizio Sarri's men had 11 shots in the opening period - the most Real had seen in a Champions League game since facing 15 against Juventus in 2013.
Mertens's deflected shot flew over the bar for a corner after Amadou Diawara's inch-perfect pass early on.
But Napoli saw captain Marek Hamsik, Lorenzo Insigne, and Mertens failed to beat Keylor Navas in the visitor's net before before the Belgium midfielder sent the stadium into raptures.
On Madrid's first real foray, Luka Modric outmanoeuvred Kalidou Koulibaly to deliver a back-post cross that Reina collected after a mix-up between Ronaldo and Karim Benzema.
Insigne, who caught out Zidane's side with a long-range drive in Madrid, came close to another long-distance goal with a dipping shot from 35 yards that forced Navas down low at his near post.
Gareth Bale escaped down the right to deliver a cross that Kroos, from the edge of the area, volleyed straight at Reina.
But Real was left ball-watching on 24 minutes after a slick passing move between Hamsik and Mertens that saw the Belgian run in to beat Navas at his bottom-left corner.
The San Paolo erupted, but relief reigned moments later when Ronaldo rounded Reina to see his low drive come off the base of the post.
Napoli could have had a second but after being sent though by Mertens, Hamsik fired high and wide before seeing his shot from the right byline blocked by Navas.
When Hamsik gave away possession minutes after the restart, Toni Kroos' dangerous cross to the back post was cleared by the head of Mertens.
But danger of Hamsik's error became apparent when Ramos rose to meet Kroos' corner to stretch the back of the Napoli net.
The host's dream died a minute later. Kroos delivered again from the corner flag and Ramos' glancing header at the near post came off Mertens to leave Reina rooted to the spot.
(Photos courtesy: Action Images)