Aga Radwanska and Hsieh Su-Wei are about to get under way. This should be fun.

It's Kerber up next for her, though - how fascinating will that be? Very, is the answer.

Hsieh is looking really good, and is so interesting to watch. She might be unorthodox but that's entertaining.

HSIEH 6-2 7-5 RADWANSKA: Tenacious rallying from Hsieh Su-Wei, just exhausting Radwanska, who serves her first double fault of the set. Hsieh takes her second match point and reaches the second week of a slam for the first time in a decade!

HSIEH 6-2 6-5 RADWANSKA: Radwanska is cursing the let cord, which is not her friend; Hsieh's team are urging her on now. Can she break and finish this off?

HSIEH 6-2 5-5 RADWANSKA: A more tentative game from Hsieh as Radwanska ratchets up the pressure.

HSIEH 6-2 5-4 RADWANSKA: And a love service game for Hsieh, putting a halt to Radwanska's momentum and recovering some of that earlier aggression.

HSIEH 6-2 4-4 RADWANSKA: Strong service game from Radwanska, and some ballooning returns from Hsieh.

HSIEH 6-2 4-3 RADWANSKA: Radwanska breaks back and this is such terrific rallying! Clever, creative, fleet of foot.

HSIEH 6-2 4-2 RADWANSKA: Another break to love for Hsieh, using the drop shot to great effect, and making the most of Radwanska's hampered movement.

HSIEH 6-2 3-2 RADWANSKA: The Pole is coming to the net more, and after this game has her knee taped up again. It's possible this additional movement is troubling her.

HSIEH 6-2 2-2 RADWANSKA: This is a resurgent Radwanska now, fuelled by her anger, perhaps.

Radwanska is having her knee taped up again.

HSIEH 6-2 2-1 RADWANSKA: Radwanska breaks back, and is aggrieved by insects on court. There's plenty of rage on show out there.

HSIEH 6-2 2-0 RADWANSKA: Agnieszka Radwanska is not a happy woman and is debating with the chair umpire's decision not to let her replay a point. She demands to speak to the supervisor - who overrules the chair. Exciting! Hsieh still breaks to love, though.

HSIEH 6-2 1-0 RADWANSKA: Radwanska is putting up more of a fight with the added support of that tape round her left knee, but it's Hsieh who claws her way to a hold.

Hsieh is swishing some strokes about while Radwanska has her knee taped up.

The trainer is out and looking at Radwanska's left knee.

HSIEH 6-2 RADWANSKA: Radwanska's forehand is lacking, and the flags are waving for Hsieh Su-Wei, looking to back up her impressive win against Garbine Muguruza here.

HSIEH 5-2 RADWANSKA: Hsieh has an unusual game but it's working for her. She'll have the chance to serve this first set out.