Mezue ahịrịokwu na-esonụ: Clemens si na ezumike nka pụta, bịanye aka na nkwekọrịta otu afọ ya na obodo ya bụ Houston Astros na Jenụwarị 12, 2004, na-esonyere ezigbo enyi ya na onye otu Yankees bụ Andy Pettitte. Na Mee 5, 2004, Clemens dekọtara ya 4.137th ọrụ strikeout iji tinye ya nke abụọ na ndepụta oge niile n'azụ Nolan Ryan. Akpọrọ ya onye mbido maka otu National League All-Star mana n'ikpeazụ ọ bụ onye na-efunahụ n'egwuregwu ahụ mgbe o nyechara ọsọ isii na ise, gụnyere ịgba ọsọ atọ na Alfonso Soriano. Clemens mechiri oge ahụ na ndekọ 18 <unk> 4, ma nye ya Cy Young Award nke asaa ya, wee bụrụ onye ọkpụkpọ kacha okenye nke meriri Cy Young na afọ 42. Nke a mere ka ọ bụrụ otu n'ime ndị pitchers isii iji merie ihe nrite na asọmpi abụọ ahụ, na-esonyere Gaylord Perry, Pedro Martínez, na Randy Johnson na Roy Halladay na Max Scherzer. Clemens bụ onye na-agba bọọlụ na-efunahụ ndị Astros n'egwuregwu 7 nke
2004 NLCS megide St. Louis Cardinals, na-enye ohere 4 na-agba ọsọ na 6 innings nke ọrụ. Ọ bụ ezie na ọ na-atụba nke ọma, ike gwụrụ ya n'agba nke isii, na-enyefe agba anọ niile.