Hello, some things to consider would be a team can have many players but players can not have more than one team. So change TeamID to [FK] and also add to the Players table. The players table will have PlayerID [PK] and TeamID [FK].
The other issue is your scores table is currently irrelevant because there's no common attribute between them. I would insert the TeamID[FK] column to the scores table. I would also add a Division column in the scores table.
I hope this helps, you could also look at ER Diagram design tutorials.