Professional wrestling
In matches with multiple competitors, an elimination system may be used. Any wrestler who has a fall scored against them is forced out of the match, and the match continues until only one remains. However, it is much more common when more than two wrestlers are involved to simply go one fall, with the one scoring the fall, regardless of who they scored it against, being the winner. In championship matches, this means that, unlike one-on-one matches (where the champion can simply disqualify themselves or get themselves counted out to retain the title via the "champion's advantag"), the champion does not have to be pinned or involved in the decision to lose the championship. However, heel champions often find advantages, not in champion's advantage, but in the use of weapons and outside interference, as these poly-sided matches tend to involve no holds barred rules.

Q: What usually happens when two or more wrestlers are involved?
to simply go one fall, with the one scoring the fall, regardless of who they scored it against, being the winner.