Postpublished at 08:34 Greenwich Mean Time 26 January 2018
Federer 0-0 Chung*
Right then, Hyeon Chung will serve first.
Image source, ReutersSummary
Roger Federer through to final after Hyeon Chung retires with injury
Chung unable to carry on because of blisters
Federer was leading 6-1 5-2 when Chung quit
Federer will go for 20th Grand Slam on Sunda
Swiss star will face Croatia's Marin Cilic
Postpublished at 08:34 Greenwich Mean Time 26 January 2018
Image source, ReutersTune inpublished at 08:34 Greenwich Mean Time 26 January 2018
Federer v Chung
Fancy listening to this one? Well follow the link at the top of the page and tune in to our live commentary from Rod Laver Arena...
Right said Fed...published at 08:34 Greenwich Mean Time 26 January 2018
Federer v Chung
Image source, ReutersIt's one Grand Slam legend down, one to go on Hyeon Chung's run to what he hopes is his first Australian Open final.
But Roger Federer hasn't clocked up 19 major titles without doing his homework.
The Swiss admits he knew little about the South Korean before his heroics at Melbourne Park, but he's certainly put a marker on him now...
"I'm very excited to play Chung. I thought he played an incredible match against Novak," said Federer.
"I mean, to beat him here is one of the tough things to do in our sport, I believe."
Where it all beganpublished at 08:30 Greenwich Mean Time 26 January 2018
Federer v Chung
Chung Hyeon, who comes from the South Korean city of Suwon, began playing tennis at six years old.
His father and older brother were already involved in the game, and his doctor had recommended that looking at the colour green would help with his weak eyesight.
As a teenager, he moved to the IMG tennis training academy in Florida before turning pro in 2014 and returning to South Korea. He's now based in Seoul and trains under South African coach Neville Godwin.
Image source, Getty ImagesSpotting the silverwarepublished at 08:29 Greenwich Mean Time 26 January 2018
Federer v Chung
Gigi Salmon
Radio 5 live sports extra commentator at Melbourne ParkI came across the trophies going for a walk around Melbourne Park!
Image source, BBC SportChung's 'personality and humour' shining throughpublished at 08:26 Greenwich Mean Time 26 January 2018
Federer v Chung
Hyeon Chung's coach Neville Godwin is enjoying his charge's run at the Australian Open.
"He is feeling really relaxed, he's just got to go out there and do what he can do," Godwin told Eurosport.
"The great thing is his personality and humour is coming out on the court, his English is getting better every day."
Postpublished at 08:25 Greenwich Mean Time 26 January 2018
Federer v Chung
Image source, Getty ImagesLoving these poses with the Australian Open hashtag at Melbourne Park...
I'll be asking for the Hyeon Chung calendar for Christmas.
What do you know about... The Professor?published at 08:23 Greenwich Mean Time 26 January 2018
Federer v Chung
Image source, ReutersHe's the science goggle-style spectacled South Korean who has warmed the Melbourne crowds with some scintillating tennis and candid on-court interviews, but just who is Hyeon Chung?
The 21-year-old won the 2015 ATP Most Improved Player award and signaled his coming of age with his big breakthrough at the 'NextGen' ATP finals in Milan, where he beat Russia's Andrey Rublev in November.
Chung will become the highest-ranked South Korean player in history after the Australian Open when he will break into the top 30.
He could go as high as 10th in the world, if he wins the tournament.
The Korean has modeled his game on childhood idol Novak Djokovic and has been dubbed "The Professor" due to his trademark thick white-rimmed glasses, after being diagnosed with weak eyesight as a child.
Like clockwork...published at 08:19 Greenwich Mean Time 26 January 2018
Federer v Chung
Image source, ReutersLike clockwork, Roger Federer plays in another Australian Open semi-final.
This will be the Swiss' 14th in the past 15 years, only failing to make at least the last four in 2015.
The 36-year-old is aiming to reach a seventh final at Melbourne Park, having won the title on five occasions.
'What an amazing couple of weeks'published at 08:16 Greenwich Mean Time 26 January 2018
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Cilic to face the winnerpublished at 08:14 Greenwich Mean Time 26 January 2018
Federer v Chung
Croatia's sixth seed Marin Cilic awaits the winner in the Australian Open final, after he ended Briton Kyle Edmund's run in Melbourne.
Cilic won 6-2 7-6 (7-4) 6-2 to reach his first final at the tournament.
The 2014 US Open champion dominated from the outset, while Edmund required a medical timeout after the first set and appeared to be hindered in the closing stages.
A closed roof?published at 08:10 Greenwich Mean Time 26 January 2018
Cat Archer
BBC Radio 5 live sports extra at Melbourne ParkClouds rolling in over the Rod Laver Arena. The roof is closed already for the nightly light show, and if the rain keeps falling - it might not open. Advantage Federer?
Image source, BBC SportHow they got herepublished at 08:07 Greenwich Mean Time 26 January 2018
Federer v Chung
Roger Federer has cruised through to the Australian Open semi-final.
The Swiss is yet to drop a set at the tournament, seeing off Aljaz Bedene, Jan-Lennard Struff, Richard Gasquet, Marton Fucsovics and Tomas Berdych to reach the last four.
Berdych came closest, before wasting a chance to serve for the first set, and it was the 36-year-old number two seed who kept his perfect record intact.
Hyeon Chung's journey has been less straightforward, knocking out both Zverevs, Daniil Medvedev, the mighty Novak Djokovic and then Tennys Sandgren in the quarter-finals.
A thrilling three-setter against Djokovic will be the one that sticks in the mind, but fourth seed Alexander Zverev is the only man to have snatched a set from the Korean so far.
Soggy Australia Daypublished at 08:03 Greenwich Mean Time 26 January 2018
Piers Newbery
BBC Sport at Melbourne Park
Image source, BBC SportVegemite on toast, fairy bread, lamingtons, Tim Tams, ANZAC biscuits... Happy Straya (Australia) Day!
[Other spreadables, cakes and biscuits are available].
That's right, it's the annual day of celebrating all things Australian, and what could be more Australian than watching top-quality sport? Albeit involving Roger Federer and Hyeon Chung.
A humid afternoon broke into rain as the evening approached, and apparently we have a 50% chance of more showers during this evening's match, so this one could involve the roof.
A final awaits...published at 08:00
Federer v Chung
Image source, ReutersAspiration? Ambition? An Australian Open final awaiting?
Roger Federer has been there, done that, got the 19-time Grand Slam winner t-shirt.
Rod Laver Arena is like a second home for the sensational Swiss, who has swooped to glory five times in Melbourne.
He faces a dangerous daydreamer, a 21-year-old daring to dump the defending champion out in a semi-final fling between experienced assassin and young pretender.
Hyeon Chung's already in wonderland, but he's not yet ready to jump off the ride...
Image source, Getty Images