WTA round-up: Caroline Wozniacki had to graft to book her place in the WTA Luxembourg semi-finals against Bojana Jovanovski.
Ana Ivanovic moved into the quarter-finals in Linz with a 6-3 7-5 win over Francesca Schiavone.
Serena Williams and Victoria Azarenka are one step away from booking a tantalising championship rematch at the US Open.
The paths to the US Open women's semi-finals to be played on Friday at the US National Tennis Center in Flushing Meadows.
Victoria Azarenka beat Daniela Hantuchova 6-2 6-3 to set up a US Open semi-final clash with Italy's Flavia Pennetta.
Flavia Pennetta's journey to the last four of the US Open has been one of the more unexpected successes for Italy.
Flavia Pennetta reached her first Grand Slam semi-final after beating Roberta Vinci 6-4 6-1 at the US Open.
Victoria Azarenka booked her place in the quarter-finals of the US Open when she beat Serbia's Ana Ivanovic 4-6 6-3 6-4.
Victoria Azarenka paid tribute to the old brigade after she joined five players over the age of 30 in the US Open last eight.
The first time Daniela Hantuchova reached the US Open quarter-finals she was a teenager. The second time she is 30.
ATP World Tour Finals
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