Sport universe

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Across
  1. 1. a person who trains a person or team in sport
  2. 5. invite (someone) to engage in a contest
  3. 7. to have the same number of points
  4. 8. an athletic or sports ground with tiers of seats for spectators
  5. 10. to not be successful in achieving something
Down
  1. 2. a person that you are playing or fighting against in a game
  2. 3. win a victory over (someone) in a battle or other contest
  3. 4. an official who watches a game or match closely to ensure that the rules are adhered to
  4. 6. the ability to do something well
  5. 9. a prize such as money, etc. for something that somebody has done