pˈiːnə mˌeɪd hɪz mˈeɪdʒɚ lˈiːɡ pˈɪtʃɪŋ deɪbjˈuː ˌɔn dʒuːlˈaɪ twˈɛnti wˈʌn, pɚfˈɔːɹmɪŋ mˈɑːpˌʌp dˈuːɾi ɪn ɐ nˈaɪntiːn fˈoːɹ blˈoʊaʊt lˈɔs tə ðə dɪtɹˈɔɪt tˈaɪɡɚz.
Pena made his major league pitching debut on July 21, performing mop-up duty in a 19–4 blowout loss to the Detroit Tigers.