[2] Military After attending the Luisengymnasium in Berlin, Müller joined the 1st Foot Guard Regiment of the Prussian Army on October 1, 1892, and was promoted to second lieutenant by the end of January 1894.
From April 20, 1909, to March 21, 1910, he was on the General Staff of the VIII Army Corps and then returned to his main regiment with the appointment as Chief of the 8th Company.
From June 30, 1914, Müller was personal adjutant to the last German Crown Prince, Wilhelm of Prussia, until he took his leave on November 26, 1918.
He reached the quarterfinals in singles with three straight victories but was eliminated there against Ladislav Žemla from Bohemia, who later participated in the Olympics.
The family originates from Mecklenburg-Schwerin and begins the lineage with Adam Möller († 1693), who was Amtmann in Redentin near Wismar from 1689.