Serena will face former World No.1 Victoria Azarenka in the semi finals. Azarenka reached the semi finals of the US Open after 7 years. She defeated Elise Mertons 6-1, 6-0 in the quarterfinals. There have been 22 bouts between Serena and Azarenka so far. Serena has won 18 matches and Azarenka 4 matches. Serena had previously defeated Azarenka in the finals of the 2012 and 2013 US Open.