Billie Jean King gives advice to Serena
According to Billie Jean King, fitness could be the key to Serena Williams achieving that goal.
Williams has won a record 23 grand slam singles titles in tennis' Open era.
CNN reports that she could equal Margaret Court's all-time mark with an eighth Wimbledon title.
Williams has struggled with injury this season.
"I would say to everybody: 'You guys ... have to get totally fit.''