Federer beats Struff 6-4 6-4 7-6 (7-4)
Top women's seed Halep beats Bouchard 6-2 6-2
Konta & Muguruza out, Djokovic & Sharapova through
Temperature approaches 40C in Melbourne
#bbctennis
Maximilian Poole: Federer broken! Great Struff.
Dorothy Darling: Can I blame Federer for missed deadlines? Perils of working from home. My desk chair spinning around faster than a Roger top spin forehand.
Yes, tennis is always a valid excuse.
Federer 6-4 6-4 3-3 Struff*
Federer gets out of jail by holding with an ace. He might be a little rattled here?
Federer 6-4 6-4 2-3 Struff*
Roger Federer was being very Roger Federer and racing through games in the first two sets.
Now, he's taking a bit more time and thought - and it's not really working. He throws away two points by hitting the net and going wide and soon Struff has another break point to play with.
An overhead smash can't be retrieved by the German so we go to deuce.
*Federer 6-4 6-4 2-3 Struff
Jan-Lennard Struff adjusts his jaunty baseball cap. He looks annoyed after netting for 30-30.
It's OK, though. Federer totally skies a forehand.
A third double fault makes Struff angry again. After deuce, Federer has an intimidate break-back opportunity.
And with a fantastic backhand pick-up, Federer snatches a game back.
Federer 6-4 6-4 1-3 Struff*
It's not huge. Struff hits mega long to take us to deuce.
But wait - the German has another shot at the break after Federer nets.
And he's done it! Federer can't clear the net after a brutal forehand from Struff. A big moment for the world number 55.
Federer 6-4 6-4 1-2 Struff*
A second serve ace takes Federer to 30-0.
For some reason, the Swiss tries to lob Struff, who at 6ft 5ins is always going to have the go-gadget arms to reach it. He does and swats down.
And all of a sudden, Struff has break point - his first of the match. This could be huge!
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David Law
Radio 5 live sports extra commentator at Melbourne Park
It will mildly irritate Roger Federer that he didn't manage to get the break after all that hard work.
*Federer 6-4 6-4 1-2 Struff
Make that two break points saved by Struff. A sweeping forehand does the job.
But yet again, a backhand error from the youngster gives Federer a third break point. That's saved by a booming ace - Struff's third of the match.
Now he has the advantage. Can he take it? Yep, he's pulled out another ace. A good recovery from the German.
*Federer 6-4 6-4 1-1 Struff
Roger Federer starts to eat away at Struff's serve so the world number 55 takes a breather by grabbing a towel and wiping his brow.
The pair go to deuce and Federer's stretching return is volleyed long by Struff. Break point.
Federer nets on the backhand. Back to deuce.
Federer 6-4 6-4 1-1 Struff*
One minute and three seconds later, Federer also holds to love. Slow it down, lads. I can't keep up.
*Federer 6-4 6-4 0-1 Struff
Jan-Lennard Struff doesn't look perturbed by what's in front of him (the G.O.A.T).
He's going about his service games in an orderly fashion, and holds to love to get off the mark in the third set.
Mark Woodforde
Australian 12-time Grand Slam doubles champion on BBC Radio 5 live sports extra
The speed of Struff's game has dropped off slightly and is giving Federer the chance to increase his power play.
Federer 6-4 6-4 Struff
A big forehand overpowers Struff and Federer gets off the mark.
And then a big serve does the same.
Struff nets on the backhand as Federer earns three set points.
He needs just one.
Federer 6-4 5-4 Struff*
Struff matches Federer with a love hold but is it only delaying the inevitable?
The world number two will serve for the second set.
Image source, Getty ImagesFederer 6-4 5-3 Struff*
This is becoming routine for Federer now.
Another hold to love. Struff to serve to stay in this set
*Federer 6-4 4-3 Struff
Struff decides he's going to set up shop at the net but Federer's not keen on that sort of exchange, so he pummels are forehand past his opponent into the corner.
At 30-30, the German nets and hands the defending champion a break point. He's converted one out of four so far.
Make that two from five. A big backhand gives Federer the game.
Federer 6-4 3-3 Struff*
Brutal intensity from Federer. He holds to love without batting an eyelid.
He's gone for a new racquet as he looks for the break in this second set.
Image source, EPA
Piers Newbery
BBC Sport at Melbourne Park
The yellow-clad 'Fanatics' here to support Aussie Ash Barty earlier are now trying to get a chorus of "Let's go Roger, let's go!" up and running. Bit cheeky. They've been joined by some French fans who are going through the entire routine of chants heard at Roland Garros. Quite magical.
Down below, Federer and Struff are providing some good entertainment, with the Swiss summoning a few rueful grins on his strolls between points as he tries to make the breakthrough in the second set.
*Federer 6-4 2-3 Struff
Jan-Lennard Struff is holding his own, despite some aggressive play from Federer.
After mucking up an earlier volley, the German world number 55 gets the next one right and holds to edge ahead in the second set.