A goal in each half by Kasper Dolberg, who plays his club football for Nice, and late goals by wing-back Joakim Maehle and striker Martin Braithwaite secured a 4-0 passage into the quarter-finals with Wales limited to just one shot on target.
Playing in Ajax’s stadium in Amsterdam, by half-time it was clear Denmark were well on top although Wales started the game the brighter side.
Gareth Bale went close inside 10 minutes and Christensen and his colleague at the back had to make a succession of blocks on shots.
The Danes soon grew into the game and scored midway through the first half thanks to a fine strike from outside the area by Dolberg. After a penetrating passing move, he curled with power into the bottom corner.