PVP with Scores by mahd_h

First set the scoreboards:-

/scoreboard objectives add Wins playerKillCount

Set the teams before setting the players:-

/scoreboard teams add <Your team name>

/scoreboard teams add <opponent's team name>

then, set the players:-

/scoreboard players add <your username> Wins

/scoreboard players add <opponent's username> Wins

(If the two commands above do not work, then remove 'Wins')

Optional: set the objective wins:-

/scoreboard players set <your username> Wins <Max Score>

/scoreboard players set <opponent's username> Wins <Max Score>

Set the score to display:-

/scoreboard objectives setdisplay belowName Wins

/scoreboard objectives setdisplay sidebar Wins

If these commands do not work, please let me know.