Peru's build up to the tournament was overshadowed by the controversy over Paolo Guerrero's selection. Yet Cueva struck an terrible penalty, leaving the red-and-white clad Peru fans distraught.
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 lovely city of Saransk.
"Peru are an outstanding team", he said.
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.
Peru created the better chances throughout the 90 minutes and missed a penalty through Christian Cueva, but a second-half strike from Yussuf Poulsen extended Denmark's unbeaten run to 16 matches, as well as ending Peru's 15-game undefeated streak.
And given the format of the World Cup, which sees Denmark up against Australia in just five days' time, the midfielder may find himself missing out on part of his country's journey depending on the severity of his rib injury.
Fans are blaming Sergio Ramos for Egypt's heartbreaking World Cup loss
Egypt's coach, Hector Cuper has explained why he opted to keep Liverpool star Mohammed Salah on the bench in Egypt's opening game against Uruguay.
Denmark midfielder William Kvist was taken off on a stretcher after a sustaining a blow to the ribs in a challenge with Farfan, and disaster nearly struck for Age Hareide's men when Cueva was brought down in the penalty area by Poulsen.
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.
One of Peru's key attacking players' this World Cup, Christian Cueva had the ideal chance to give his side the lead just before half-time against Denmark.
Back in the World Cup for the first time in 36 years, Peru have invaded Russian Federation - seas of red and white taking over Moscow and Saransk - the venue for Saturday's Group C opener 630 kilometres east of the capital.
It was a sublime save that secured all three points for Denmark from a game many observers feel they probably deserved to lose.
Peru are back at the World Cup after a 36-year absence and face Denmark for the second time ever.
It was to prove a costly miss, and Peru must be more clinical if they are to have any chance of qualifying.