Wow. Hosts Russia have stunned the footballing world this morning, eliminating 2010 champions Spain through a penalty shootout to book their quarter-final spot.
With the match 1-1 after extra time, spot kicks were needed for the second time in the day to decide a last-16 tie.
Neither team found a breakthrough and the match advanced to a penalty-kick shootout, were each side saved the first attempt before making their next two shots.
Croatia were stunned inside 60 seconds by an early Danish aerial assault as Jonas Knudsen's whipped throw-in reached Thomas Delaney, who simply screened the ball and left it to Mathias Jorgensen to poke it home.
Croatia have an experienced squad which could at least match their best-ever finish of a third place which happened in 1998 World Cup.
Croatia midfielder Luka Modric has labelled Denmark's Christian Eriksen a "world-class player" ahead of Sunday's World Cup last-16 clash in Nizhny Novgorod. The stage is now set for the 32-year old to deliver World Cup glory for the Croatians.
Two chaotic goals in the opening four minutes made for a rollicking start at the Nizhny Novgorod Stadium.
Yussuf Poulsen - 7 - When Denmark attacked, the lively lynchpin was extremely threatening, and always looked capable of producing a moment of brilliance for his side. "It's seldom that we play like this, and the game against Croatia will be a very different spectacle".
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12 minute: Corner for Croatia.
Croatia celebrate their round of 16 Fifa World Cup win over Denmark.
Three minutes of added time, Denmark have plenty forward trying to pinch a victor.
Hareide said there are no plans to nullify Real Madrid's Modric, arguably the best midfield player of the tournament to date.
After the interval, the chances were even more sparse although Croatia did up the tempo towards the end of regulation time only to run into a resolute Denmark defence.
Christian Eriksen - The playmaker is Denmark's biggest hope of defeating Croatia.
Forwards: Mario Mandzukic (Juventus/ITA), Ivan Perisic (Inter Milan/ITA), Nikola Kalinic (AC Milan/ITA), Andrej Kramaric (Hoffenheim/GER), Marko Pjaca (Schalke/GER), Ante Rebic (Eintracht/GER).
Jorgensen fired a low effort at the goalkeeper after turning well inside the area with Denmark now looking the more risky, and Eriksen dragged a half-chance wide soon afterwards.