public void onPlayerTeleport(PlayerTeleportEvent event){
    if (event.getTo().equals(SettingsManager.getInstance().getLobbySpawn())){
        Player player = event.getPlayer();
        GameManager manager = GameManager.getInstance();

        int gameID = manager.getPlayerGameId();
        Game game = manager.getGame(gameID);

        if (game.getActivePlayers() == 1){
            // Here player should be the player that won.
        }
    }
}