Welcome to our LIVE coverage of fourth seed Agnieszka Radwanska's match against Anna-Lena Friedsam of Germany.

GAME, SET AND MATCH! - FRIEDSAM 7-6(6) 1-6 5-7 RADWANSKA. A rollercoaster of a match goes the way of the number four seed who fights back from 2-5 down in the decider to fend off a potential shock and move into the last eight. It's hard on Friedsam who is in tears as the players shake hands at the net. Her body gave up on her right at the end. It's Sanchez Navarro or Gavrilova next for Aga.

BREAK! - FRIEDSAM 7-6(6) 1-6 5-6 RADWANSKA. Heartbreaking stuff from the German. Her body is giving up and she is in floods of tears. A time violation sees her service game end prematurely and in unfortunate circumstances. Can she summon anything at all here to stop Aga serving this out?

FRIEDSAM 7-6(6) 1-6 5-5 RADWANSKA. We are all square! Radwanska is pushed to deuce from 15-30 down but sees it out with a show of real mental strength. A lovely cushioned volley at the net is followed by some big-hitting that sees Friedsam block long of the baseline.

Play about to resume. Aga serving to stay in it. she's 4-5 down in the third.

MEDICAL TIME-OUT: Friedsam receiving treatment on the top of her left leg. Radwanska will be frustrated having got her Mojo going...

BREAK! - FRIEDSAM 7-6(6) 1-6 5-4 RADWANSKA. The momentum swings once more! Radwanska saves herself with a spirited return game. A stonking forehand winner appears to put Anna-Lena in the driving seat, but the Pole responds and secures a potentially match-saving break back by outlasting the youngster in a lung-bursting final rally.

FRIEDSAM 7-6(6) 1-6 5-3 RADWANSKA. It's a hold too love for the fourth seed who stops the rot. Over to Friedsam - has she got the bottle to see this one out?

FRIEDSAM 7-6(6) 1-6 5-2 RADWANSKA. The run just keeps going. It's five in a row with a hold to 30. The German punches the air. She's just one game away from a huge upset.

BREAK! - FRIEDSAM 7-6(6) 1-6 4-2 RADWANSKA. What a rollercoaster of a match! The impetuousness of youth sees Friedsam make it four in a row. It's really come out of the blue, but she'll be desperate to keep this purple patch going to see the job out noow. She needs all three chances from triple break point to make it count as Aga fires down two big first serves. A gutsy rally sees the German eventually prevail as a firm double-handed backhand drive is too hot for the Pole to return.

FRIEDSAM 7-6(6) 1-6 3-2 RADWANSKA. After an almost flawless second set, the mistakes are creeping back into Aga's game. It's allowing her opponent to build some momentum. It's three in a row now for Anna-Lena as she holds to 30 to edge in front.

FRIEDSAM 7-6(6) 1-6 2-2 RADWANSKA. Has the pendulum inexplicably swung back the way of Anna-Lena? The 21-year-old racks up triple break point, only to let Aga back in for deuce. A superb return offers a fourth chance and this time the Pole can't pull off the defence. It's all square and a huge boost for the youngster.

PHOTO: Rampant Radwanska.

FRIEDSAM 7-6(6) 1-6 1-2 RADWANSKA. Real grit and resilience from the German underdog. She's being made to work extremely hard for the simplest of points but deservedly gets on the board as a fourth ace helps her end the number four seed's relentless run of games.

FRIEDSAM 7-6(6) 1-6 0-2 RADWANSKA. One-way traffic now. Radwanska follows up an immediate break with a decent hold to move ahead in the match.

An artist at work...

SET! - FRIEDSAM 7-6(6) 1-6 RADWANSKA. Impressive stuff from the player the rest of the WTA stars like to dub 'the professor'. It takes just 26 minutes for her to calculate her way back into this with a comfortable hold - and it's 1-1. The Pole must feel confident for the decider now. Can Friedsam dig deep to find the form that put her on the frontfoot just half an hour ago?