YOU SAID:
The tennis match took place once in a blue moon.
INTO JAPANESE
テニスの試合は、一度ブルームーンで起こった。
BACK INTO ENGLISH
Tennis game happened, once in a blue moon.
INTO JAPANESE
テニスのゲームは、一度ブルームーンで起こった。
BACK INTO ENGLISH
Tennis game happened, once in a blue moon.
You've done this before, haven't you.