Serena and Venus Williams won their US Open second-round matches on Wednesday to set up a 30th career meeting, while reigning champion Sloane Stephens also advanced to the third round and will next face two-time Grand Slam champion Victoria Azarenka, who was a runner-up in New York in 2012 and 2013.
Six-time champion Serena, who gave birth to daughter Olympia during last year’s tournament, unleashed 30 winners and 13 aces to beat German world No.101 Carina Witthoeft 6-2 6-2 in 67 minutes, while Venus, two-time US Open champion, battled for one hour and 51 minutes to defeat Italian Camila Giorgi 6-4 7-5.