sˈɑːnənbˌɜːɡ wʌz ɐɡˈɛn ɹˈɛkəɡnˌaɪzd æz wˈɜːld tʃˈæmpiən ɪnðə bˈɔstən ˈɛɹiə ɪn nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi nˈaɪn, ˈæftɚ dᵻfˈiːɾɪŋ ænd ʌnmˈæskɪŋ ðə ʃˈædoʊ mˈɑːɹvɪn wˈɛstənbˌɜːɡ tə bɪkˌʌm ðɪ ɐmˈɛɹɪkən ɹˈɛsəlɪŋ ɐsˌoʊsɪˈeɪʃən tʃˈæmpiən.
Sonnenberg was again recognized as world champion in the Boston area in 1939, after defeating and unmasking The Shadow (Marvin Westenberg) to become the American Wrestling Association champion.