Java: Layout

Jeg er ved at lave et layout, men har lavet denne lille eksempelkode, for at illustrere mit problem:

import javax.swing.*;
import java.awt.*;

class Main {

    public static void main(String[] args) {
        JFrame frame = new JFrame("Testing layout");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel centerPanel = new JPanel(new BorderLayout());
       
            JPanel centerTopPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
            centerPanel.add(centerTopPanel, BorderLayout.NORTH);

            JPanel centerLeftPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
            centerPanel.add(centerLeftPanel, BorderLayout.WEST);

            JPanel centerCenterPanel = new JPanel();
            centerCenterPanel.setLayout(new BoxLayout(centerCenterPanel, BoxLayout.Y_AXIS));
            centerPanel.add(centerCenterPanel, BorderLayout.CENTER);

            JPanel centerRightPanel = new JPanel(new BorderLayout());
            centerPanel.add(centerRightPanel, BorderLayout.EAST);
       
        //creating centerTop Panel
        centerTopPanel.add(new JLabel("Headline"));
       
        //creating centerLeft Panel
        centerLeftPanel.add(new JLabel("New game:"));
           
        //creating centerCenter panel
        JPanel contentPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
       
        JPanel formPanel = new JPanel(new GridLayout(0,1));
        JPanel buttonPanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
       
        JLabel competitor1Label = new JLabel("Start 1:");
        competitor1Label.setFont(new Font("Dialog",Font.BOLD,12));
        JComboBox competitor1Box = new JComboBox();
        competitor1Box.addItem("test");
        competitor1Box.addItem("test");
        competitor1Box.addItem("test");
        competitor1Box.setPreferredSize(new Dimension(150,20));
        formPanel.add(competitor1Label);
        formPanel.add(competitor1Box);
       
        JLabel competitor2Label = new JLabel("Start 2:");
        competitor2Label.setFont(new Font("Dialog",Font.BOLD,12));
        JComboBox competitor2Box = new JComboBox();
        competitor2Box.addItem("test");
        competitor2Box.addItem("test");
        competitor2Box.addItem("test");
        competitor2Box.setPreferredSize(new Dimension(150,20));
        formPanel.add(competitor2Label);
        formPanel.add(competitor2Box);
       
        contentPanel.add(formPanel);
        contentPanel.add(buttonPanel);
       
        centerCenterPanel.add(contentPanel);
//        centerCenterPanel.add(formPanel);
//        centerCenterPanel.add(buttonPanel);
       
        //creating right panel
        JLabel headlineRightLabel = new JLabel("Your sales:",JLabel.LEFT);
        centerRightPanel.add(headlineRightLabel,BorderLayout.NORTH);
       
        JList couponList = new JList();
        couponList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        JScrollPane scrollCouponList = new JScrollPane(couponList);
        scrollCouponList.setPreferredSize(new Dimension(250,300));
        JPanel scrollPanel = new JPanel();
        scrollPanel.add(scrollCouponList);
        centerRightPanel.add(scrollPanel,BorderLayout.CENTER);
       
        //creating bottom panel
        JButton createButton = new JButton("Spil");
        buttonPanel.add(createButton);

        frame.add(centerPanel, BorderLayout.CENTER);

        frame.setSize(800,500);
        frame.setLocation(200,200);
        frame.setVisible(true);
    }

}

Som I kan se, så ligger min "spil" knap forkert i layoutet? Det skyldes at mine Panels ligger sig efter hinanden, istedet for at atarte under det andet. Hvordan kan jeg få det flyttet ned under det andet?