Clemens ayaa ka soo baxay howlgabnimada, isagoo saxiixay heshiis hal sano ah oo uu la galay kooxda Houston Astros 12kii Janaayo, 2004, isagoo ku biiray saaxiibkiis dhow iyo saaxiibkii hore ee Yankees Andy Pettitte. Bishii Meey 5, 2004, Clemens wuxuu diiwaan geliyay 4,137th ee xirfadiisa xirfadeed si uu ugu dhigo kaalinta labaad ee liiska waqtiga oo dhan Nolan Ryan. Waxaa loo magacaabay inuu bilaabo kooxda Xiddigaha Xiddigaha ee National League laakiin ugu dambeyntii wuxuu ahaa kii ku guuldareystay ciyaartaas ka dib markii uu u oggolaaday lix orod shan jeer, oo ay ku jiraan saddex-dhibcood oo uu ku guuleystay Alfonso Soriano. Clemens wuxuu ku dhameystay xilli ciyaareedkii isagoo leh rikoor 18<unk>4, waxaana la siiyay abaalmarintiisii toddobaad ee Cy Young, isagoo noqday ciyaaryahankii ugu da'da weynaa abid ee ku guuleysta Cy Young da'da 42. Tani waxay ka dhigtay mid ka mid ah lixda xiddig ee ku guuleystay abaalmarinta labada horyaal, iyagoo ku biiray Gaylord Perry, Pedro Martínez, iyo Randy Johnson oo markii dambe ay ku biireen Roy Halladay iyo Max Scherzer. Clemens wuxuu ahaa ciyaaryahankii ugu badiyay Astros ciyaartii 7aad ee 2004 NLCS
St. Louis Cardinals, wuxuu u ogolaaday 4 dhibcood 6 wareega ciyaarta. Inkastoo uu si fiican u tuuray, haddana wuu daalay wareegga lixaad, isagoo iska dhiibay afarta dhibcoodba.