 Nyorai kupfuurira kweiyi ndima - Akaberekerwa muCologne, Müller akatanga kubudirira somunhu asina ruzivo. Akakunda menduru yebronze pa 1925 European ChampionshipsmuStockholm muchikamu chewelterweight, uye muna 1927 muBerlin, akahwina ndarama muchikamu chelight heavyweight. Akakunda mukwikwidzi wenyika yeGerman katatu, muna 1925 muwelterweight, muna 1926 mu middleweight, uye muna 1927 mu light heavyweight. 