Hsieh takes out another seed

Hsieh Su-Wei backs up her excellent win over Garbiñe Muguruza by taking out another top-ranked opponent in Agnieszka Radwanska, winning 6-2 7-5. The woman from Chinese Taipei last reached a Grand Slam fourth round a decade ago, and it came here at the Australian Open as a qualifier when Justine Henin eventually halted her run. This time it will be up to the in-form Angelique Kerber to stop Hsieh, but the 32-year-old is flying high on confidence. She mustered 31 winners today, and as long as she keeps hitting her targets she will be a match for anyone.