ˌɔn sɛptˈɛmbɚ fˈoːɹ, nˈaɪntiːnhˈʌndɹɪd twˈɛlv, mˈeɪɚ mˌeɪd hɪz mˈeɪdʒɚ lˈiːɡ deɪbjˈuː æz ɐ mˈɛmbɚɹ ʌvðə fɪlɐdˈɛlfiə fˈɪliz ɪn ðɛɹ ɡˈeɪm ɐɡˈɛnst ðə nˈuː jˈɔːɹk dʒˈaɪənts.
On September 4, 1912, Mayer made his major league debut as a member of the Philadelphia Phillies in their game against the New York Giants.