Good morning, and welcome to our live coverage of Stefanos Tsitsipas against Roger Federer. The match begins at 8am UK time on the Rod Laver Arena.

S. Tsitsipas vs R. Federer | Australian Open
Men's Singles | Round 4 | 20.01.2019 | Rod Laver Arena
Completed
S. Tsitsipas (14)
S. Tsitsipas (14)
611
77
7
77

R. Federer (3)
R. Federer (3)
713
63
5
65
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Alex Chick
By
Alex Chick
Updated 20/01/2019 at 12:11 GMT
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Of course Tsitsipas also praises Federer, saying, "I've been idolising him since the age of six...it's a dream come true to just be on Rod Laver facing him."
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Tsitsipas is in no fit mindset to talk to Commissioner of Tennis John McEnroe, but he does let slip that he always thought he'd win this match. What a great attitude!
Tsitsipas's team are weeping. He looks stunned.
12:02
The NextGen champion has beaten the old guard! That tiebreak had everything, poor challenges from both players, great serving, mistakes from Tsitsipas off the Federer drop shot, and finally a return into the net on match point.
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TSITSIPAS 6-7 7-6 7-5 7-6 FEDERER: HE'S DONE IT! 7-5 ON THE TIEBREAK!
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TSITSIPAS 6-7 7-6 7-5 6-6 FEDERER: So. A tiebreak it is.
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TSITSIPAS 6-7 7-6 7-5 6-5 FEDERER: Nobody could do anything about that blistering Tsitsipas serve; he brings out another ace in this hold to love.
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TSITSIPAS 6-7 7-6 7-5 5-5 FEDERER: Well, that's a pretty solid service game to face down the possibility of losing a match.
TSITSIPAS 6-7 7-6 7-5 5-4 FEDERER: Federer makes the passing shot and gets pretty much a standing ovation. Not enough, though, and Tsitsipas holds again. He needs to break and he wins. Easy.
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TSITSIPAS 6-7 7-6 7-5 4-4 FEDERER: Crowd well behind Federer here after that little interlude, and he holds to 15.
11:37
Tsitsipas is now taking his time getting back on to court, and he's getting some real stick from the crowd.
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And now Tsitsipas is having a leg massage.
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Tsitsipas is having a chat with the trainers, and is indicating his left elbow!
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TSITSIPAS 6-7 7-6 7-5 4-3 FEDERER: Ah, but they're moving OK on his serve! Galloping to the net, and feinting beautifully.
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TSITSIPAS 6-7 7-6 7-5 3-3 FEDERER: Federer uses the drop shot, baffling Tsitsipas, who has suddenly stopped being able to move properly.
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Tsitsipas is having a chat with James Keothavong - he's called for the trainer at the next change of ends. This could be big.
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TSITSIPAS 6-7 7-6 7-5 3-2 FEDERER: Federer is still looking for that gap to break. Incidentally, Tsitsipas has no challenges remaining