diff --git a/packages/material-ui/src/ButtonBase/createRippleHandler.js b/packages/material-ui/src/ButtonBase/createRippleHandler.js
index 6c50acb9092f9f..3a4ac98dc1ad34 100644
--- a/packages/material-ui/src/ButtonBase/createRippleHandler.js
+++ b/packages/material-ui/src/ButtonBase/createRippleHandler.js
@@ -6,6 +6,7 @@ function createRippleHandler(instance, eventName, action, cb) {
 
     let ignore = false;
 
+    // Ignore events that have been `event.preventDefault()` marked.
     if (event.defaultPrevented) {
       ignore = true;
     }
diff --git a/packages/material-ui/src/Modal/Modal.js b/packages/material-ui/src/Modal/Modal.js
index ad6b1d98290dac..24b9f7293bd3e9 100644
--- a/packages/material-ui/src/Modal/Modal.js
+++ b/packages/material-ui/src/Modal/Modal.js
@@ -159,6 +159,11 @@ class Modal extends React.Component {
       return;
     }
 
+    // Ignore events that have been `event.preventDefault()` marked.
+    if (event.defaultPrevented) {
+      return;
+    }
+
     if (this.props.onEscapeKeyDown) {
       this.props.onEscapeKeyDown(event);
     }
diff --git a/packages/material-ui/src/Modal/Modal.test.js b/packages/material-ui/src/Modal/Modal.test.js
index 024b87f4da9404..92fad2fdd5db1c 100644
--- a/packages/material-ui/src/Modal/Modal.test.js
+++ b/packages/material-ui/src/Modal/Modal.test.js
@@ -249,24 +249,19 @@ describe('<Modal />', () => {
   describe('handleDocumentKeyDown()', () => {
     let wrapper;
     let instance;
-    let onEscapeKeyDownStub;
-    let onCloseStub;
+    let onEscapeKeyDownSpy;
+    let onCloseSpy;
     let topModalStub;
     let event;
 
     beforeEach(() => {
-      wrapper = shallow(<Modal open={false} />);
-      instance = wrapper.instance();
-      onEscapeKeyDownStub = stub().returns(true);
-      onCloseStub = stub().returns(true);
+      onEscapeKeyDownSpy = spy();
+      onCloseSpy = spy();
       topModalStub = stub();
-      wrapper.setProps({ onEscapeKeyDown: onEscapeKeyDownStub, onClose: onCloseStub });
-    });
-
-    afterEach(() => {
-      onEscapeKeyDownStub.reset();
-      onCloseStub.reset();
-      topModalStub.reset();
+      wrapper = shallow(
+        <Modal open={false} onEscapeKeyDown={onEscapeKeyDownSpy} onClose={onCloseSpy} />,
+      );
+      instance = wrapper.instance();
     });
 
     it('should have handleDocumentKeyDown', () => {
@@ -275,66 +270,66 @@ describe('<Modal />', () => {
     });
 
     it('when not mounted should not call onEscapeKeyDown and onClose', () => {
-      instance = wrapper.instance();
-      instance.mounted = false;
       instance.handleDocumentKeyDown(undefined);
-      assert.strictEqual(onEscapeKeyDownStub.callCount, 0);
-      assert.strictEqual(onCloseStub.callCount, 0);
+      assert.strictEqual(onEscapeKeyDownSpy.callCount, 0);
+      assert.strictEqual(onCloseSpy.callCount, 0);
     });
 
     it('when mounted and not TopModal should not call onEscapeKeyDown and onClose', () => {
-      topModalStub.returns('false');
+      topModalStub.returns(false);
       wrapper.setProps({ manager: { isTopModal: topModalStub } });
-      instance = wrapper.instance();
-      instance.mounted = true;
 
       instance.handleDocumentKeyDown(undefined);
       assert.strictEqual(topModalStub.callCount, 1);
-      assert.strictEqual(onEscapeKeyDownStub.callCount, 0);
-      assert.strictEqual(onCloseStub.callCount, 0);
+      assert.strictEqual(onEscapeKeyDownSpy.callCount, 0);
+      assert.strictEqual(onCloseSpy.callCount, 0);
     });
 
     it('when mounted, TopModal and event not esc should not call given funcs', () => {
       topModalStub.returns(true);
       wrapper.setProps({ manager: { isTopModal: topModalStub } });
-      instance = wrapper.instance();
-      instance.mounted = true;
       event = { keyCode: keycode('j') }; // Not 'esc'
 
       instance.handleDocumentKeyDown(event);
       assert.strictEqual(topModalStub.callCount, 1);
-      assert.strictEqual(onEscapeKeyDownStub.callCount, 0);
-      assert.strictEqual(onCloseStub.callCount, 0);
+      assert.strictEqual(onEscapeKeyDownSpy.callCount, 0);
+      assert.strictEqual(onCloseSpy.callCount, 0);
     });
 
     it('should call onEscapeKeyDown and onClose', () => {
       topModalStub.returns(true);
       wrapper.setProps({ manager: { isTopModal: topModalStub } });
       event = { keyCode: keycode('esc') };
-      instance = wrapper.instance();
-      instance.mounted = true;
 
       instance.handleDocumentKeyDown(event);
       assert.strictEqual(topModalStub.callCount, 1);
-      assert.strictEqual(onEscapeKeyDownStub.callCount, 1);
-      assert.strictEqual(onEscapeKeyDownStub.calledWith(event), true);
-      assert.strictEqual(onCloseStub.callCount, 1);
-      assert.strictEqual(onCloseStub.calledWith(event), true);
+      assert.strictEqual(onEscapeKeyDownSpy.callCount, 1);
+      assert.strictEqual(onEscapeKeyDownSpy.calledWith(event), true);
+      assert.strictEqual(onCloseSpy.callCount, 1);
+      assert.strictEqual(onCloseSpy.calledWith(event), true);
     });
 
     it('when disableEscapeKeyDown should call only onClose', () => {
       topModalStub.returns(true);
-      wrapper.setProps({ manager: { isTopModal: topModalStub } });
-      wrapper.setProps({ disableEscapeKeyDown: true });
+      wrapper.setProps({ disableEscapeKeyDown: true, manager: { isTopModal: topModalStub } });
       event = { keyCode: keycode('esc') };
-      instance = wrapper.instance();
-      instance.mounted = true;
 
       instance.handleDocumentKeyDown(event);
       assert.strictEqual(topModalStub.callCount, 1);
-      assert.strictEqual(onEscapeKeyDownStub.callCount, 1);
-      assert.strictEqual(onEscapeKeyDownStub.calledWith(event), true);
-      assert.strictEqual(onCloseStub.callCount, 0);
+      assert.strictEqual(onEscapeKeyDownSpy.callCount, 1);
+      assert.strictEqual(onEscapeKeyDownSpy.calledWith(event), true);
+      assert.strictEqual(onCloseSpy.callCount, 0);
+    });
+
+    it('should not be call when defaultPrevented', () => {
+      topModalStub.returns(true);
+      wrapper.setProps({ disableEscapeKeyDown: true, manager: { isTopModal: topModalStub } });
+      event = { keyCode: keycode('esc'), defaultPrevented: true };
+
+      instance.handleDocumentKeyDown(event);
+      assert.strictEqual(topModalStub.callCount, 1);
+      assert.strictEqual(onEscapeKeyDownSpy.callCount, 0);
+      assert.strictEqual(onCloseSpy.callCount, 0);
     });
   });