They do a lot of research before the game, and they usually have some “cheat sheets” prepared for them they can look at during the event. It’s easier if you just do one sport, and eventually you start learning everyone naturally. It’s not that they just sit down and learn every team by heart all at once.
It’s similar to any profession really. How does a pharmacist memorize every medication and side effect? How does a DJ know every song? Etc. It’s a combination of experience, research, and a passion for the subject matter.
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