Wozniacki teaches 16yo a lesson

All quarter finalists are decided in both Taipei City and St Petersburg.

Caroline Wozniacki (1), after her first round bye in St Petersburg, played a second round match against 16 year old Russian Anastasia Potapova.

The teenager, ranked 235, had a win against top 50 player Tatjana Maria, which rocketed her to 199 in the live rankings.

Naturally it would be a tough ask facing up to the recently crowned Australian Open champion, but a fantastic opportunity nevertheless.

It was an easy win for Wozniacki on the scoreboard, but Potapova won 9 points from the 20 serves that the top seed delivered, which is a stat with which she can be pleased.

However Wozniacki created 21 break points in the match - she only needed to convert 7 - and this was how the score line was finalised at 6-0 6-1.

Potapova never held serve for the entire match, and her only game won was with a break of the Wozniacki serve.

A great experience for the promising young Russian and a predictable start for the top seed.

Quarter finals are:

Caroline Wozniacki (1) v Daria Kasatkina (8)

Kasatkina defeated Alize Cornet 6-2 6-1 in the second round

Kristina Mladenovic (4) v Katerina Siniakova 

Mladenovic defeated Dominika Cibulkova 6-4 6-4 in the second round

Siniakova defeated Ekaterina Makarova 7-6(7) 7-5 in the second round

Julia Goerges (5) v qualifier Elena Rybakina 

Goerges defeated qualifier Roberta Vinci 7-5 6-0 in the second round

Rybakina defeated Caroline Garcia (3) 4-6 7-6(6) 7-5(5) in the second round

Wildcard Petra Kvitova v Jelena Ostapenko (2)

Kvitová defeated Irina-Camelia Begu 6-3 1-6 6-1 in the second round

Ostapenko defeated wildcard Vera Zvonareva 7-6(6) 7-3 in the second round

In Taipei City the quarter finals are:

Wildcard Eugenie Bouchard v Yafan Wang

Bouchard defeated Ana Bogdan 7-5 7-5 in the second round

Wang defeated Pauline Parmentier (8) 6-3 6-3 in the second round 

Timea Babos (4) v Magda Linette (7)

Babos defeated Dalila Jakupovic 6-3 4-6 6-2 in the second round 

Linette defeated Johanna Larsson 6-1 6-7(4) 7-6(3) in the second round 

Monica Niculescu v Sabine Lisicki 

Niculescu defeated Zarina Diyas (6) 6-0 1-6 6-4 in the second round 

Lisicki defeated Nao Hibino 6-4 6-1 in the second round 

Yulia Putintseva (5) v Kateryna Kozlova

Putintseva defeated wildcard Kai-Chen Chang 6-3 7-6(3) in the second round 

Kozlova defeated Ying-Ying Duan 3-6 6-2 7-6(4) in the second round