Calculating MMR Changes in an individual players Matchmaking Rating (MMR) are determined by which team won the match. When you win, the MMR of all players in your team goes up, while the opposite is true for when you lose.

How does MMR work Shadowlands?

Matchmaking Rating (also known as MMR) is a number calculated for each player to match them with players of similar skill in PvP. The intent behind MMR is to match players by skill. This is accomplished by comparing an assigned number (MMR) that adjusts based on the relative MMR of the opponents you win or lose to.