Hello, @azuki . Blocking a friend will remove them from the Friend List and add them to the Black List. They will be unable to enter your profile in any way. That means they can't contact or harass you. However, matchmaking depends on how many players are currently playing on the specific game mode, map, team mode, perspective, server and platform. If there are less people to play the map or team mode at that moment, you will be able to match with them.