diff --git a/src/main/java/app/Config.java b/src/main/java/app/Config.java
index 12df0fd..77b684e 100644
--- a/src/main/java/app/Config.java
+++ b/src/main/java/app/Config.java
@@ -65,5 +65,12 @@ public GetAverageGradeUseCase getAverageGradeUseCase() {
         return new GetAverageGradeUseCase(gradeDataBase);
     }
 
-    // TODO Task 4: add code for the new GetTopGradeUseCase following the same pattern as the other use cases above.
+    /**
+     * Get the GetTopGradeUseCase object.
+     * @return GetTopGradeUseCase object.
+     */
+    public GetTopGradeUseCase getTopGradeUseCase() {
+        return new GetTopGradeUseCase(gradeDataBase);
+    }
+
 }
diff --git a/src/main/java/app/gui/Application.java b/src/main/java/app/gui/Application.java
index a083b09..9bd4ad3 100644
--- a/src/main/java/app/gui/Application.java
+++ b/src/main/java/app/gui/Application.java
@@ -17,12 +17,7 @@
 import api.MongoGradeDataBase;
 import app.Config;
 import entity.Grade;
-import usecase.FormTeamUseCase;
-import usecase.GetAverageGradeUseCase;
-import usecase.GetGradeUseCase;
-import usecase.JoinTeamUseCase;
-import usecase.LeaveTeamUseCase;
-import usecase.LogGradeUseCase;
+import usecase.*;
 
 /**
  * GUI class to run the GUI for the Grade App.
@@ -51,6 +46,7 @@ public static void main(String[] args) {
         final JoinTeamUseCase joinTeamUseCase = config.joinTeamUseCase();
         final LeaveTeamUseCase leaveTeamUseCase = config.leaveTeamUseCase();
         final GetAverageGradeUseCase getAverageGradeUseCase = config.getAverageGradeUseCase();
+        final GetTopGradeUseCase getTopGradeUseCase = config.getTopGradeUseCase();
 
         // this is the code that runs to set up our GUI
         SwingUtilities.invokeLater(() -> {
@@ -66,7 +62,7 @@ public static void main(String[] args) {
             final JPanel logGradeCard = createLogGradeCard(frame, logGradeUseCase);
             final JPanel formTeamCard = createFormTeamCard(frame, formTeamUseCase);
             final JPanel joinTeamCard = createJoinTeamCard(frame, joinTeamUseCase);
-            final JPanel manageTeamCard = createManageTeamCard(frame, leaveTeamUseCase, getAverageGradeUseCase);
+            final JPanel manageTeamCard = createManageTeamCard(frame, leaveTeamUseCase, getAverageGradeUseCase, getTopGradeUseCase);
 
             cardPanel.add(defaultCard, "DefaultCard");
             cardPanel.add(getGradeCard, "GetGradeCard");
@@ -237,16 +233,15 @@ private static JPanel createJoinTeamCard(JFrame jFrame, JoinTeamUseCase joinTeam
         return theCard;
     }
 
-    // TODO Task 4: modify this method so that it takes in a getTopGradeUseCase
-    //              Note: this will require you to update the code which calls this method.
+
     private static JPanel createManageTeamCard(JFrame jFrame, LeaveTeamUseCase leaveTeamUseCase,
-                                               GetAverageGradeUseCase getAverageGradeUseCase) {
+                                               GetAverageGradeUseCase getAverageGradeUseCase, GetTopGradeUseCase getTopGradeUseCase) {
         final JPanel theCard = new JPanel();
         theCard.setLayout(new GridLayout(ROWS, COLS));
         final JTextField courseField = new JTextField(20);
         // make a separate line.
         final JButton getAverageButton = new JButton("Get Average Grade");
-        // TODO Task 4: Add another button for "Get Top Grade" (check the getAverageButton for example)
+        final JButton getTopGrade = new JButton("Get Top Grade");
 
         final JButton leaveTeamButton = new JButton("Leave Team");
         final JLabel resultLabel = new JLabel();
@@ -263,8 +258,18 @@ private static JPanel createManageTeamCard(JFrame jFrame, LeaveTeamUseCase leave
                 JOptionPane.showMessageDialog(jFrame, ex.getMessage());
             }
         });
+        getTopGrade.addActionListener(event -> {
+            final String course1 = courseField.getText();
+            try {
+                final float top = getTopGradeUseCase.getTopGrade(course1);
+                JOptionPane.showMessageDialog(jFrame, "Top Grade: " + top);
+                courseField.setText("");
+            }
+            catch (Exception ex) {
+                JOptionPane.showMessageDialog(jFrame, ex.getMessage());
+            }
+        });
 
-        // TODO Task 4: Add action listener for getTopGrade button, follow example of getAverageButton
 
         leaveTeamButton.addActionListener(event -> {
             try {