 After having lost the world title, he returned to Denmark only to lose two matches in Copenhagen to Danish veteran Dick Nelson on December 2, 1914, and February 14, 1915, one for the Scandinavian Welterweight title.Holberg had his last professional fight on August 29, 1921 when he was stopped in Vienna by Austrian Hans Hirschberger.Holberg retired from professional boxing in 1921 after his loss to Hirschberger.