However, depending on the type of match and the context, here are some possibilities:
General:
* Audience - This is the most general and widely understood term.
* Spectators - A slightly more formal term for those watching.
* Crowd - Implies a large and enthusiastic group.
* Viewership - Refers to the total number of people watching.
Specific:
* Gallery - Often used for spectators at a boxing match.
* Supporters - Used for fans of a particular team or competitor.
* Followers - May be used for online viewers of a match.
Ultimately, the best collective noun will depend on the specific situation and the desired tone.