Denmark started by playing long balls directed at their wingers to take advantage of their superior height factor but mostly ended up playing catch up to Peru's slick short passing game for the opening half-hour.
The dead-ball specialist will look to exploit Peru's diminutive team (one of the smallest in the tournament), by providing excellent service to his countrymen (some of the tallest in the tournament).
Schmeichel was also fortunate, and not only on Cueva's missed penalty kick.
With an exciting attack consisting of Andre Carrillo, Christian Cueva, Edison Flores and Jefferson Farfan, Peru were a constant danger to the Danish defence, stretching Andreas Christensen and Simon Kjaer.
Hello and welcome to the live coverage of the FIFA World Cup 2018 clash between Peru and Denmark as we get Group C underway in the handsome city of Saransk.
"Of course it was an emotional game", Poulsen told reporters.
"Peru did as much as possible to win the game and score".
Played in by Eriksen and with goalkeeper Pedro Gallese coming out to narrow the angle, the Dane coolly slotted the ball inside the near post and put his side in a good position.
The use of video assistant referees continues to provoke debate, and it was called into use again on Saturday when Peru were awarded a penalty in an incident initially missed by the referee.
However, Cueva wasted the chance, stuttering on his run-up and then blazing his effort about three yards over the crossbar despite sending Schmeichel the wrong way.
With 11 minutes left, Guerrero almost scored one of the goals of the early stages of this tournament with the Flamengo forward sending a back-heel towards the far bottom corner from 10 yards, only to watch on as the ball went agonisingly wide with Schmeichel beaten.
The last time the Leicester City goalkeeper conceded a goal for Denmark came in their 5-1 play-off win over the Republic of Ireland, in November 2017.
Peru are back at the World Cup after a 36-year absence and face Denmark for the second time ever.
If you weren't a Peru fan before, you probably are now.
It was to prove a costly miss, and Peru must be more clinical if they are to have any chance of qualifying.