Robson through to final four in Australia

Laura Robson was a set up but trailing 5-2 when her opponent retired injured during their quarter final in Melbourne.

With conditions climbing to over 40°C on court for a second successive day, Robson won the first set 6-3 but her opponent Elena Bogdan began to play a far more attacking game in the second set and built up a 5-1 lead.

Stretching for a wide ball, Bogan went over on her ankle and looked in considerable pain. After a medical time out and against the advice of the doctor, Bogdan decided to play on although she was clearly struggling to put any weight on her ankle.

With Bogdan wanting to play on in an attempt to secure the second set knowing that the heat rule would force play to be suspended, it was up to the doctor to declare the Romanian unable to continue. Robson is through to her second Grand Slam semi final and will face top seed Noppawan Lertcheewakarn for a place in the final.

Meanwhile, Heather Watson was defeated by third seed Ksenia Pervak 4-6 5-7. The 16 year old battled bravely in the heat and had chances against her higher ranked Russian opponent but was unable to win the crucial points.

Peter Norfolk's Aussie Open quad singles title defence also suffered a set-back as he lost against world No.1 David Wagner 2-6 6-2 4-6. However, the round-robin format means if he beats American Nick Taylor in his last pool match, he will progress to the final to face Wagner for the title.