hˈɑːp mˌeɪd hɪz kˈɑːɹdɪnəl deɪbjˈuː ˌɔn sɛptˈɛmbɚɹ ˈeɪtiːn, nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi nˈaɪn, ænd ˈɛntɚd ðə bˈɪɡ lˈiːɡz fɔːɹ ɡˈʊd ðə fˈɑːloʊɪŋ sˈiːzən.
Hopp made his Cardinal debut on September 18, 1939, and entered the big leagues for good the following season.