Serena, Venus set for 30th showdown

Serena and Venus Williams will clash for the 30th time on Friday with a place in the last 16 of the US Open at stake.

Six-time champion Serena eased into the third round with a 6-2, 6-2 victory over German world No 101 Carina Witthoeft on the back of 30 winners and 13 aces.

Venus, the 2000 and 2001 champion in New York, made the third round for the 17th time with a 6-4, 7-5 victory over Camila Giorgi of Italy.