Boulter holdspublished at 09:37 Greenwich Mean Time 16 January
*Kudermetova 7-6 (7-3) 2-6 2-2 Boulter
We remain on serve in this deciding set.
Katie Boulter looks focussed, can she make inroads on the Veronika Kudermetova serve?

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
Jess Anderson, Emily Salley and Alicia Turner
*Kudermetova 7-6 (7-3) 2-6 2-2 Boulter
We remain on serve in this deciding set.
Katie Boulter looks focussed, can she make inroads on the Veronika Kudermetova serve?
Sinner 4-6 3-3 Schoolkate*
Finally. After 80 minutes, Jannik Sinner has got himself a break point.
Three, in fact.
Sinner 4-6 3-3 Schoolkate*
Sealed with an ace. Jannik Sinner wraps up another relatively comfortable service hold and passes the pressure back to Tristan Schoolkate.
Kudermetova 7-6 (7-3) 2-6 2-1 Boulter*
Veronika Kudermetova applies the pressure, advancing into the net and forcing the error from Katie Boulter to save break point.
She keeps up that pressure to take the hold.
*Sinner 4-6 2-3 Schoolkate
This is a great stat - Tristan Schoolkate is the first person to take a set off Jannik Sinner in 102 days.
The world number one last dropped a set at the Shanghai Masters in October and he had won 29 sets in a row before Schoolkate struck.
The Australian is forced to deuce by Sinner (again), but he manages to pull free (again). Another successful escape.
*Kudermetova 7-6 (7-3) 2-6 1-1 Boulter
Indeed, Katie Boulter looks up for this as she works herself a break point.
*Kudermetova 7-6 (7-3) 2-6 1-1 Boulter
Leon Smith
GB Davis Cup captain on BBC Radio 5 Live and BBC Sounds
Just looking at Katie Boulter, her eyes, she looks so ready for this, so engaged, she looks ready to pounce.
*Kudermetova 7-6 (7-3) 2-6 1-1 Boulter
Leon Smith
GB Davis Cup captain on BBC Radio 5 Live and BBC Sounds
What's interesting at this point in the match is you can get a foothold, both can reset, they are both calm and focused.
*Kudermetova 7-6 (7-3) 2-6 1-1 Boulter
Katie Boulter takes the hold to 15 and we remain on serve in set three.
Who can call this one?
Sinner 4-6 2-2 Schoolkate*
Tristan Schoolkate takes advantage of Jannik Sinner's weaker second serve to open up a 15-30 lead, but the defending champion claws his way back with two big serves before wrapping up the hold.
On we go...
Kudermetova 7-6 (7-3) 2-6 1-0 Boulter*
That feels like an important hold for Veronika Kudermetova.
Katie Boulter pummels her return into the net and the Russian is the first on the board in set three.
*Kudermetova 7-6 (7-3) 2-6 0-0 Boulter
Into a deciding set we go.
Katie Boulter looking to put immediate pressure on the Veronika Kudermetova serve as she gets to 30-30 but she sends a forehand long and that gives the Russian game point.
*Sinner 4-6 1-2 Schoolkate
The first signs of frustration from Jannik Sinner, who once again forces his way to deuce on Tristan Schoolkate's serve but the Australian somehow keeps managing to wriggle free.
The world number one has yet to earn himself a break point opportunity.
Kudermetova 7-6 (7-3) 2-6 Boulter
Katie Boulter back in business in this match!
We're all square in sets after a remarkable turnaround from the British number one.
Kudermetova 7-6 (7-3) 2-5 Boulter*
Leon Smith
GB Davis Cup captain on BBC Radio 5 Live and BBC Sounds
Veronika Kudermetova seems like she's in a better place mentally, she's calm and composed and getting herself ready for the points despite being 5-2 down in this set.
Kudermetova 7-6 (7-3) 2-5 Boulter*
Katie Boulter, serving for the set, quickly gets herself out to set point.
Can she take it at the first opportunity?
Sinner 4-6 1-1 Schoolkate*
The last time Jannik Sinner lost in the first round of a Grand Slam was back in 2021 at Wimbledon. The Italian is a long way from defeat here and he keeps the pace with Tristan Schoolkate with a relatively straightforward hold.
Fonseca 7-6 (8-6) 3-6 1-6 6-3 Sonego
Joao Fonseca looked down and out not long ago, but he's turned things around on 1573 Arena against Lorenzo Sonego.
After losing five straight games in the third set, the Brazilian teenager opens up a 3-0 lead in the fourth and sees it out from there to force a decider.
The 18-year-old qualifier, who established himself as a rising star by triumphing at last month's Next Gen Finals, is currently on a 14-match winning run. He's one to watch, for sure.
Kudermetova 7-6 (7-3) 2-5 Boulter*
Wow.
Katie Boulter takes her chance and she's restored her double-break advantage in this second set.
Once again that competitive spirit is guiding her through this.
*Kudermetova 7-6 (7-3) 2-4 Boulter
Leon Smith
GB Davis Cup captain on BBC Radio 5 Live and BBC Sounds
It's got a little bit scrappy from both players in the last couple of games, there's an opportunity here if Katie Boulter can bring a bit of dominance which she's had in this second set.