The second half was a different matter, however, and when Denmark scored, it followed a period of dominance that deserved a goal.
Denmark playmaker Christian Eriksen was a callow teenager mostly confined to the bench at his first World Cup in South Africa, but eight years later he will carry his country's hopes on his shoulders as they kick off against Peru on Saturday. Cueva stepped up to the spot and cannoned the ball over the bar as the sides went into the break at 0-0.
Denmark, for whom Thomas Delaney had shot over, were forced into a change in the 35th minute as the injured William Kvist was substituted for Lasse Schone and three minutes later Eriksen sent a free-kick into the wall, with Schone's effort on the rebound being dealt with by goalkeeper Pedro Gallese.
(COMBO) This combination of pictures created on June 14, 2018 shows Peru's Jefferson Farfan (L) in Lima, Peru, on November 15, 2017, and Denmark's midfielder Christian Eriksen (R) in Dublin on November 14, 2017. But the team failed to capitalize on any of them, sometimes missing the goal by inches.
The South American outfit have even come up against strong opposition such as Croatia and Iceland and still been victorious, so Ricardo Gareca will be confident his side can string a shock or two in Russian Federation.
Flores had a shot well saved by Schmiechel moments later before coming off for Guerrero, who nearly immediately sent a header into the Leicester keeper's arms.
On the defensive end, right back Luis Advincula was sensational in both defending and bombing forward down the byline to support the attack.
"We were playing against a truly great team with very, very good players and the atmosphere in the stadium has nothing to do with what happened on the pitch".
As a result, Peru dominated the opening 25 minutes, but after weathering the early storm, the Danes started to push forward.
The defence also looks solid with a centre-back pairing of Andreas Bjelland and captain Simon Kjaer.
Eriksen is Denmark's talisman, and his influence on the team is huge. "We haven't practised that very much, but we have practised a lot at being a team", Hareide said.
With the first games in Group C completed, seeing two sides victorious and two failing to get off the mark, the group is set for an entertaining and intriguing final set of games and eventual outcome.
Instead, the situation has been largely diffused by a show of solidarity among players in and outside of Peru, including the captains of the other teams in Group C - France, Denmark and Australia.
They limped out of the 2010 World Cup at the group stage and missed the 2014 tournament entirely, and when they were beaten in a playoff by neighbours Sweden in a playoff for a spot at Euro 2016, Olsen stepped aside in favour of Hareide.