Jelena Jankovic started her WTA Tour Finals campaign with a sensational performance against world number two Victoria Azarenka, beating her 6-4, 6-3 in just under two hours. 

Despite having not won any of her last 17 games against top four opposition, it was clear from the start that Jankovic wasn't distracted by this and she was quickly into her stride.

The first set was an even encounter, both players pressuring the opponents serve but ultimately holding, until the game reached 2-2, as Jankovic took the initiative, outclassing Azarenka and breaking serve.

She then moved into a 4-2 lead, holding her next two service games to take the first set, holding off heavy pressure as the Belarusian tried to stay in the set. 

The second set played out very similarly, as Jankovic still didn't show any signs of losing her advantage, winning points and having all the answers in the important rallies. She slowly began to push Azarenka out of the set and broke twice, securing a 6-4, 6-3 win, illustrating the form that saw her reach the finals in Beijing.

It puts her in a good position in Group 2, level on one win with Azarenka (who beat Sara Errani 7-6, 6-2 in her first game) and Li Na, who piled even more misery on Errani today, as she came through a tight second set to win 6-3, 7-6. 

The game started well for Na, as she bullied Errani, making the most of her early chances to go a break ahead. But far from letting her head drop Errani threw everything at Na, whose game began to be penetrated with more unforced errors. 

Nevertheless, Na stuck at it and won the first set 6-3, but was taken by surprise early in the second, as Errani exploded into the set, quickly racking up an early break. 

This appeared a brief comeback though, as Na once more took hold and took a run of four straight games without giving her Italian opponent a chance. She seemingly had the game in her possession and only had to hold serve to claim a hard fought victory.

This proved impossible as the dogged determination of Errani made it difficult for Na to hit winners and player her game and from nowhere, the Italian had forced the game into a tie break. 

By this point, the set had changed hands several times and it was not clear who would make the decisive move. Even in the tie break, it wasn't clear what player would come out on top, until Na raised her game and with a mini-break, claimed the advantage. 

She finally managed to close the game and knocked Errani out of the tournament, her tournament seemingly ruined by a calf injury picked up in her previous game. For Na, she now enters a three horse race for progress into the next round, needing a win over Azarenka or Jankovic to give her a real chance of progress.

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