diff --git a/packages/router/src/url_tree.ts b/packages/router/src/url_tree.ts
index 010e7556ea..7dd79e97c9 100644
--- a/packages/router/src/url_tree.ts
+++ b/packages/router/src/url_tree.ts
@@ -341,6 +341,11 @@ function serializeSegment(segment: UrlSegmentGroup, root: boolean): string {
       return [`${k}:${serializeSegment(v, false)}`];
     });
 
+    // use no parenthesis if the only child is a primary outlet route
+    if (Object.keys(segment.children).length === 1 && segment.children[PRIMARY_OUTLET] != null) {
+      return `${serializePaths(segment)}/${children[0]}`;
+    }
+
     return `${serializePaths(segment)}/(${children.join('//')})`;
   }
 }
diff --git a/packages/router/test/create_url_tree.spec.ts b/packages/router/test/create_url_tree.spec.ts
index 36cd73c789..0fc4a19232 100644
--- a/packages/router/test/create_url_tree.spec.ts
+++ b/packages/router/test/create_url_tree.spec.ts
@@ -128,6 +128,12 @@ describe('createUrlTree', () => {
     expect(serializer.serialize(t)).toEqual('/a');
   });
 
+  it('should support removing parenthesis for primary segment on second path element', () => {
+    const p = serializer.parse('/a/(b//right:c)');
+    const t = createRoot(p, ['a', {outlets: {right: null}}]);
+    expect(serializer.serialize(t)).toEqual('/a/b');
+  });
+
   it('should update matrix parameters', () => {
     const p = serializer.parse('/a;pp=11');
     const t = createRoot(p, ['/a', {pp: 22, dd: 33}]);
diff --git a/packages/router/test/integration.spec.ts b/packages/router/test/integration.spec.ts
index 7ffe138188..09e9d43f7d 100644
--- a/packages/router/test/integration.spec.ts
+++ b/packages/router/test/integration.spec.ts
@@ -3351,7 +3351,7 @@ describe('Integration', () => {
              advance(fixture);
 
              expect(log.map((a: any) => a.path)).toEqual(['b']);
-             expect(location.path()).toEqual('/two-outlets/(a)');
+             expect(location.path()).toEqual('/two-outlets/a');
            })));
 
         it('works with a nested route',