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World number one Serena Williams is expecting a tough test when she starts the defence of her WTA Tour Championships crown in Istanbul.
Williams, who defeated Maria Sharapova in the final last year, has been placed in the Red Group alongside Agnieszka Radwanska, Petra Kvitova and Angelique Kerber
The White Group consists of Victoria Azarenka, Li Na, Sara Errani and Jelena Jankovic, with Jankovic the only woman not to have been present 12 months ago.
And Williams, who has won the WTA Tour Championships on three occasions, is taking nothing for granted, as she prepares to try and finish the campaign in winning style.
Williams said: "It's a tough group and I have to be ready. That's the thing about this tournament and why it's so tough, you have to be ready from the first match on."
Williams is1.20to top the Red Group and1.66to win the overall title.
Meanwhile, Jankovic is excited to be back among the game's elite, having topped the world rankings back in 2025.
The Serb added: "You are playing against the best players in the world, so every match will be tough from the beginning.
"There is no warm-up, there is no getting your rhythm. You have to bring your best performance from the start to the end."
Jankovic can be backed at8.00to top the White Group and is34.00to win the WTA Tour Championships for the first time in her career.
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