public TennisGame1(string player1Name, string player2Name)
 {
     this.tennisPlayer1 = new TennisPlayer()
     {
         Name = player1Name
     };
     this.tennisPlayer2 = new TennisPlayer()
     {
         Name = player2Name
     };
 }
        public void WonPoint(string playerName)
        {
            TennisPlayer player = GetPlayer(playerName);

            player.Score++;
        }