Como se dice "pool" como en deportes en español?"
In English there are many meanings for the word pool. There's the one with water, there's the sport also called Billiards, but there's one more that I don't know how to translate to Spanish. It's used when a bunch of teams are playing against each other in a tournament and you need to determine who plays who next which can be based on wins or points. At the end of the pool, each team should be playing the opponent that's closest to their own playing level. Please help me out!

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In Spanish pool can mean:

- Piscina, Alberca (with water).
- Billar (8 ball pool)
And what you're asking:

- Grupo: (There is a large pool of applicants for this job. / Soccer: The winner from pool A vs winner from pool B (El ganador del grupo A contra el ganador del equipo B.)

Another meanings:

- Pozo/Puesta del ganador (Gambling. Example: Rodney threw his money into the pool.)
- Reserva (With our team's pool of skills, the plan is sure to be a success.)

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In Spain we have a sport that it is related with your topic. It is called Waterpolo.

https://es.wikipedia.org/wiki/Waterpolo (from wikipedia).

To sum up pool in spanish mean Piscina.

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In Spanish, pool, the one with water is always called piscina, both for sports or pleasure