Spain may be through and is now on a 23-match unbeaten run, but it was far from convincing in group play and again displayed defensive frailties to concede twice against a Morocco team that hadn't scored a goal in its two previous group matches.
But he proved his value to Spain in the second half - first denying Boutaib a second goal with a save at the near post and then punching away a risky ball in the 50th minute as Mbark Boussoufa tried to reach a cross.
Spain's response to that scare was to keep the ball and bump up their possession stats, though it was the Africans who struck next when Youssef En Nesyri powered home a header from a corner with nine minutes remaining.
Ramos had the last laugh, however, as Spain snatched a barely deserved draw to clinch top spot in Group B and book a last 16 clash against Russian Federation in Moscow on July 1. The 2-2 draw means Spain finish on the top of Group B and will face the second placed team from Group A.
Spain dominated the worldwide game for almost a decade, winning an unprecedented Euro and World Cup treble between 2008-2012 with their brand of high-tempo, possession-based play anchored by the legendary Barcelona linchpin Xavi.
The game's first two goals were the clearest demonstration of Spain's odd display. It was not enough for victory but Spain must sharpen up at the back if they are to have any chance of winning the World Cup. "We learnt what it is to play at a very high level".
Spain didn't have to wait long to get back into the match.
The first half was otherwise notable for a number of crunching challenges - Morocco receiving four yellow cards and Spain defender Gerard Pique was perhaps fortunate not to be set off for a two-footed lunge. "It's true that at the level they've been playing they deserve more than zero points". "When you look at the lineup it's a mix of Real Madrid and Barcelona so these are outstanding players so our team should be commended".
Spain took top spot from Portugal on goals scored after the European champions were held to a 1-1 draw by Iran.
De Gea was criticised after his blunder gave Ronaldo one of his three goals in in Spain's draw with Portugal.
In team news, Thiago Alcantara is expected to replace Andreas Iniesta in central midfield and the Bayern Munich player could have a telling impact against Morocco.
The scorer of Spain's first equaliser, Isco oozed class throughout.
Late drama in the other Group B match saw Iran equalise against Portugal, which saw Spain through as group winners to face Russian Federation in Moscow in Sunday afternoon's last-16 clash. You can stream all World Cup matches with fuboTV (Try for free).