Serena Williams’ quest for a calendar Grand Slam is on track after a three-set US Open women’s singles quarter-final victory against sister Venus on Tuesday in New York. The 33-year old was made to work hard for her 6-2, 1-6, 6-3 win in 98 minutes minutes at the Arthur Ashe Stadium. The world number one served 12 aces and hit 35 winners.
The top seed will come up against Roberta Vinci in the semi-finals at Flushing Meadows. The Italian stopped France’s Kristina Mladenovic in a tough three-set battle. Vinci won 6-3, 7-5, 6-4 to move into the final four. On Wednesday, the quarter-final action continues in the Big Apple when Petra Kvitova plays Flavia Pennetta and Victoria Azarenka faces second seed Simona Halep.