MELBOURNE, Australia (AFP) — Ukraine's Dayana Yastremska said her mission at the Australian Open was to show pride in her war-torn home after Wednesday becoming just the second women's qualifier in the Open Era to reach the semifinals in Melbourne.

In searing conditions on Rod Laver Arena, the world No. 93 broke three times to beat unseeded Czech Linda Noskova 6-3, 6-4 in 78 minutes.

It set up a last-four clash against unseeded Russian Anna Kalinskaya or Chinese 12th seed Zheng Qinwen.

Yastremska is the first women's qualifier to reach the Last Four at the season-opening Grand Slam since Australia's Christine Matison in 1978.

"It's nice to make history, because at that time I wasn't even born," she said.

The 23-year-old wrote a message of support for Ukrainian fighters involved in the war against Russia on a TV camera lens after her win.

"I'm very proud of them," she said.

"They really deserve huge respect. I always try to write something for Ukraine, about Ukraine."

"I think it's my mission here. If I do well, I can get — tough to express. I'm just trying to give the signal to Ukraine that I'm really proud of it."

Yastremska faced a tough battle to reach the main draw at Melbourne Park, being taken the distance in all three of her qualifying matches.

But she moved up a gear when the season-opening Grand Slam started, hammering Wimbledon champion and seventh seed Marketa Vondrousova in the first round and eliminating two-time Australian Open winner Victoria Azarenka in the fourth round.

Noskova, 19, was the first to make a move in their quarter-final, breaking in the third game, only for her opponent to hit straight back to level at 2-2.

Another break in the eighth game for Yastremska gave her the chance to serve out for the set and she made no mistake.