Okay, the user wants me to translate "one-hitter" into Polish. Let me think about the possible translations. "One-hitter" can refer to someone who achieves a single success, like a baseball player who hits a home run in their only at-bat. In Polish, the direct translation might be "jednorazowy uderzyciel" but that sounds a bit literal. Alternatively, "jednorazowy strzał" could work if it's about a single shot. Wait, maybe there's a more common term. Let me check if there's an established translation for this term in Polish. If not, I should go with the most accurate literal translation. Since the user specified to translate into Polish and provide only the result, I'll go with "jednorazowy uderzyciel" as the most direct translation.