[2][3] The buildup for the fight began when Markussen said in an article on 21 February 2015, said that he wanted to meet his young Danish countryman who had just moved up into the super-middleweight division.

The challenge from Rudy did not raise the attention of the Danish boxing public, but provoked Nielsen who, after knocking out the American George Tahdooahnippah on 14 March 2015, called out Markussen to the audience at the Ballerup Super Arena.

[5] From the start, the two boxers threw themselves into each other with Nielsen had establishing his jab and repeatedly hitting Markussen with his left hand.

In the third round the fight was ended when Markussen was hit by a short left hook high on the head from a close range.

Rudy Markussen retired after this fight, while Nielsen moved up the Light Heavyweight division after a year of inactivity.