30 - Edmund will crack the top-30 for the first time thanks to making the semis.
"I believe I can win that match, like I did today and like before every other match", Edmund said after beating the world No 3, Grigor Dimitrov, 6-4, 3-6, 6-3, 6-4 to claim the biggest victory of his life.
The 21-year-old Chung from South Korea stunned six-time Australian Open champion Novak Djokovic on Monday - the Serbian's elbow continues to bother him - and next tangles with the previously little known Tennys Sandgren of the US.
"Reaching the last stage of the best tournament in the world, it's obviously very pleasing, but of course I want to keep going" added Edmund who is set to take on Rafael Nadal or Marin Čilić in the semi finals.
Dimitrov scrapped and scrambled his way into the fourth round where he played his best match of the tournament to defeat local hope Nick Kyrgios in four sets.
A tense final game saw Edmund double-fault but an ace brought up match point and then Dimitrov sliced a backhand long which was confirmed by Hawkeye.
"It's an fantastic feeling, very happy", 49th-ranked Edmund, who could face top seed Rafa Nadal in the next round if he beats Marin Cilic, said on court. "Three-set gruelling matches. I'm expecting a tough fight". He's missing the season-opening major this year after deciding to have surgery on his hip.
"He's obviously massive in British tennis". First time I played on one of the biggest courts in the world.
"With these sort of things, you are so emotionally engaged that you don't really take it in, you don't really enjoy it".
Wozniacki last made the semi-finals at Melbourne Park in 2011 and she faces a familiar foe lare Tuesday in Suarez Navarro, whose two wins in seven career meetings with her were both on clay. "There's a lot of components that come into the game", Dimitrov said. Read Match Report [ALSO LIKE] "It's a shame it happened like that, but what do you do?"
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"I'm trying to be in your footsteps this week".
"The match in Brisbane was tight".
Svitolina had won their only previous tour-level match, but had no answers on Rod Laver Arena and later said hip trouble had been bothering her all year.
She was too physical for Svitolina as she stormed into the semis, incredibly on her Australian Open debut. "The more I keep winning, the better".
"Now she's in semifinal".
The 22-year-old Belgian was due to play Australian Open qualifying in 2017 but because of her deep run in Hobart, had to miss out.
Mertens will play the victor of No. 2 seed Caroline Wozniacki's clash with Carla Suarez Navarro.
"It's unbelievable. I mean, it was not expected, especially today".
It kept alive his push for a 17th Grand Slam title and also ensured he will remain No. 1 when the new rankings come out after the tournament.