Former British number one Elena Baltacha has retired from tennis with immediate effect.
A round-up of the first day of WTA Luxembourg action, with Heather Watson and Francesca Schiavone going out early.
Ana Ivanovic moved into the quarter-finals in Linz with a 6-3 7-5 win over Francesca Schiavone.
Britain's Heather Watson crashed out of the Japan Open in the opening round in Osaka.
Serena Williams beat Francesca Schiavone 6-4 7-5 to progress to the last 16 of the China Open.
Agnieszka Radwanska eased into the final in Seoul with a straight sets win over Lara Arruabarrena.
Agnieszka Radwanska continued her devastating form with a 6-2 6-0 win over Vera Dushevina to reach the semi-finals in Seoul.
Agnieszka Radwanska cruised into the quarter-finals of the Korea Open with a crushing win over Estrella Cabeza Candela.
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.
Serena Williams took another step in defence of her US Open title by crushing Galina Voskoboeva 6-3 6-0 in the second round.
Order of play for day one of the US Open, with Rafael Nadal, Roger Federer, Serena Williams and Laura Robson all in action.
ATP World Tour Finals
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