Pete Richert (1962) is the only other pitcher to strike out six consecutive batters in his big-league debut.
pˈiːt ɹˈɪtʃɚt nˈaɪntiːnhˈʌndɹɪd sˈɪksti tˈuː ɪz ðɪ ˈoʊnli ˈʌðɚ pˈɪtʃɚ tə stɹˈaɪk ˈaʊt sˈɪks kənsˈɛkjuːtˌɪv bˈæɾɚz ɪn hɪz bˈɪɡlˈiːɡ deɪbjˈuː.