Day five of the Australian Open
Use audio icon to listen to BBC Radio 5 Sports Extra commentary (UK only) of Jasmine Paolini v Renata Zarazua
Defending champion Jannik Sinner beats world number 173 Tristan Schoolkate 4-6 6-4 6-1 6-3
GB's Katie Boulter loses 7-6 (7-3) 2-6 6-2 to Veronika Kudermetova in second round
Emma Raducanu wins 6-3 7-5 against Amanda Anisimova to reach third round for first time
*Sinner 4-6 6-4 6-1 3-1 Schoolkate
Finally!
The Rod Laver Arena crowd are on their feet as Tristan Schoolkate cups his ear after finally taking the hold.
A gruelling game but he'll be pleased with that.
Sinner 4-6 6-4 6-1 3-0 Schoolkate*
Will this game ever be won?
Six break points have come and gone.
Sinner 4-6 6-4 6-1 3-0 Schoolkate*
No he can't! Double fault at the worst of moments sends us back to deuce then he fires long to hand Jannik Sinner a fifth break point.
The Australian saves it again with effective use of the serve and volley.
Sinner 4-6 6-4 6-1 3-0 Schoolkate*
Back to deuce we go!
A rare miss from Jannik Sinner on Tristan Schoolkate's second serve saves break point.
He does exactly the same on the next point and Schoolkate has a second game point. Can he get it over the line this time?
Sinner 4-6 6-4 6-1 3-0 Schoolkate*
Jannik Sinner's backhand down the line is way out of Tristan Schoolkate's reach and he's got a fourth break point opportunity.
Sinner 4-6 6-4 6-1 3-0 Schoolkate*
Tristan Schoolkate saves break point then has to do it again to take us to deuce.
He produces a big serve that Jannik Sinner can only allow to ping off his racquet for game point but can't see it out and we're back to deuce.
Sinner 4-6 6-4 6-1 3-0 Schoolkate*
Things are looking bleak here for Tristan Schoolkate.
After losing that opening set, Jannik Sinner has dominated proceedings since then and looks well on his way to a place in the third round here as he brings up a break point.
*Sinner 4-6 6-4 6-1 3-0 Schoolkate
Jannik Sinner consolidates the break with a hold to 15 and that's three in a row in this set.
Can Tristan Schoolkate get on the board and make things tricky for Sinner?
*Sinner 4-6 6-4 6-1 2-0 Schoolkate
Jannik Sinner takes the break at the second opportunity as Tristan Schoolkate's backhand floats into the net.
Matter of time for the top seed?
Sinner 4-6 6-4 6-1 1-0 Schoolkate*
Tristan Schoolkate produces a much-needed ace to save break point but can only send his backhand long and Jannik Sinner will have another opportunity.
Sinner 4-6 6-4 6-1 1-0 Schoolkate*
Oh no!
Another double fault, Tristan Schoolkate's second of the game, hands Jannik Sinner break point.
Sinner 4-6 6-4 6-1 1-0 Schoolkate*
Woops. A double fault from Tristan Schoolkate and all of a sudden Jannik Sinner can sense an opening.
The Australian recovers well, though, with a forehand winner down the line for 30-30.
Sinner 4-6 6-4 6-1 1-0 Schoolkate*
Jannik Sinner takes the opening game of set four to 30.
Tristan Schoolkate crept back in but some big serving helped Sinner to take the hold.
*Sinner 4-6 6-4 6-1 0-0 Schoolkate
That's more like it from the defending champion.
Jannik Sinner controls the point from the baseline before dragging Tristan Schoolkate forward with the drop shot. The Australian gets there, but for once it's Sinner who comes out on top of the rapid back-and-forth hitting at the net.
World number one Sinner is in cruise control now.
Sinner 4-6 6-4 5-1 Schoolkate*
Tristian Schoolkate slams down a timely ace to stop Jannik Sinner from bringing up a set point, but he can't reach an angled cross-court winner from the Italian on the next one.
Sinner 4-6 6-4 5-1 Schoolkate*
Ryan Harrison
Former American tennis player on BBC Radio 5 Live and BBC Sounds
What Jannik Sinner does, he does remarkably well, when he's rallying from the baseline he can produce so much force behind the ball and his strokes are so compact and consistent that it's really sustainable.
Sinner 4-6 6-4 5-1 Schoolkate*
Jannik Sinner is on a roll and he's showing no signs of slowing down now. There's the hold that moves him one game away from taking the third set.
*Sinner 4-6 6-4 4-1 Schoolkate
Ryan Harrison
Former American tennis player on BBC Radio 5 Live and BBC Sounds
The impressive thing is Tristan Schoolkate is going to continue to come and ask the question, he's just going to have to take a little bit more initiative as he tries to make headway. He can't just sit back and rally with Jannik Sinner, that's not going to give him any success.
*Sinner 4-6 6-4 4-1 Schoolkate
Jannik Sinner keeps the pressure on Tristan Schoolkate's serve, stepping in to batter a backhand down the line.
But the Australian stands firm to stop the rot, holding with a booming forehand winner. He shakes a clenched fist and asks his home crowd for more noise.
The world number 173 is going to need every ounce of support he can get.
Sinner 4-6 6-4 4-0 Schoolkate*
Another comfortable hold for Jannik Sinner and while he's keeping his celebrations fairly low-key, he's got more swagger in his step and he shakes his racquet towards his team with a little smile.