![Serena Williams plays a backhand against Sabine Lisicki but was undone by her rival's serve at crucial moments. Mike Hewitt / Getty Images](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/NDDJIQBQ6R3LH3XFHSF4F6NO6U.jpg?smart=true&auth=71d37541f05c6ebd1a8e81b9648dbc382ff7b6c4fbd8b3faa4395faedb6a1d31&width=400&height=225)
Serena Williams plays a backhand against Sabine Lisicki but was undone by her rival's serve at crucial moments. Mike Hewitt / Getty Images
Serena Williams plays a backhand against Sabine Lisicki but was undone by her rival's serve at crucial moments. Mike Hewitt / Getty Images
Wimbledon: Williams and Robson exit but Li Na coasts to last-eight
Women's defending champions joins big names on the casualty list after going down to Germany's Sabine Lisicki in an inconsistent fourth-round show.