Petra Kvitova continued her run through the Australian Open draw as she saw off Sara Errani in straight sets.
Kvitova is looking to add to her Wimbledon title but she didn't have everything her own way at the beginning of the match as Errani really did stand her ground.
The world number forty eight had never been past the third round at a Grand Slam and while she battled hard an early break saw Kvitova move ahead.
Kvitova is looking to overtake Caroline Wozniacki as the world number one but she failed to serve out the set at 5-2.
Errani broke back before holding her own serve to cut the deficit to 5-4.
But Kvitova finally got the first set under her belt as she took it at the second time of asking 6-4.
And it was all about Errani at the beginning of the second set as errors littered the Kvitova game and she opened up a 4-1 lead.
But Kvitova hit back as she took the next five games on the bounce to secure a 6-4 6-4 win.
Speaking to the WTA after the match Kvitova said: "In the beginning I was a little nervous because I knew everyone was expecting it would be easy. It was probably in my head.
"Sara was playing very well, too - she had to be, because she won all the matches before."
She will now play Maria Sharapova for a place in last two, a repeat of last summer's Wimbledon final.
Sharapova came through her match with Ekaterina Makarova 6-2 6-3.
FemaleFirst Helen Earnshaw