Australian Open No.1 seed Serena Williams will face fellow American Madison Keys in the semi-final after completing an easy straight sets win over Dominika Cibulkova.
The five-time Australian Open champ needed slightly more than hour to demolish 11th seed Cibulkova 6-2 6-2 and advances to face the 19-year-old Keys, who overcame Venus Williams 6-3 4-6 6-4 also on Wednesday.
Battling a cough, Williams got off…
