Postpublished at 07:58 Greenwich Mean Time 21 January 2020
Judy Murray
Tennis coach at Melbourne Park on BBC Radio 5 live sports extra
Jammy dodger, that net cord. Boulter needed that to get back into this game.
Briton Harriet Dart wins final-set tie-break to beat Misaki Doi & reach second round
GB's Johanna Konta, Kyle Edmund, Cameron Norrie & Katie Boulter all beaten
Rafael Nadal, Danill Medvedev, Nick Kyrgios into second round
Simona Halep & Karolina Pliskova advance but Maria Sharapova loses
Heather Watson's match pushed back to Wednesday
Day two of Australian Open in Melbourne
Listen to Tennis Breakfast on BBC Radio 5 Live Sports Extra - press play button at top of page
Amy Lofthouse and Alex Bysouth
Judy Murray
Tennis coach at Melbourne Park on BBC Radio 5 live sports extra
Jammy dodger, that net cord. Boulter needed that to get back into this game.
Svitolina 6-4 3-2 Boulter*
Katie Boulter's level has just dropped a bit, but a bit of luck might change that as a wobble off the net falls her way.
Deuce.
Svitolina 6-4 3-2 Boulter*
Katie Boulter gets herself to a 30-0 lead but she lets some errors fly off her racquet and she trips into a double fault to give Elina Svitolina a break point...
Svitolina 6-4 3-2 Boulter*
Jonathan Jurejko
BBC Sport at Melbourne Park
As well as the British contingent on Team Boulter, there is also one in the Svitolina camp.
Andy Bettles has been coaching Svitolina for the past few seasons, helping her win the 2018 WTA Tour finals and reach the Wimbledon and US Open semi-finals last year.
Bumped into him in a corridor near the players' zone earlier and suggested Svitolina could be helped by his inside knowledge on his fellow Brit's game.
"Yeah, but they know a lot about Elina too," he grinned.
Svitolina 6-4 3-2 Boulter*
A clean, angled winner from Elina Svitolina as she races to a 40-0 lead and a double fault is the only blip as Svitolina gets herself in front for the first time in this set.
*Svitolina 6-4 2-2 Boulter
And Svitolina breaks back!
Katie Boulter rushes to the net but she's passed by Svitolina, and we're back on level pegging.
Svitolina 6-4 1-2 Boulter*
Excellent from Svitolina, defending everything Boulter throws at her before cracking a winner down the line for 15-30.
Boulter is under a shade of pressure as she misses her first serve, but she drives her own winner off her backhand to drag things level.
Oh, that's a big miss, though, a forehand drifting wide, and Svitolina has a break-back point...
There was a bit of argy-bargy out on court earlier between Fabio Fognini, Reilly Opelka and umpire Carlos Bernardes.
First Fognini broke his racquet and had a swear at the umpire...
...and then Opelka had a shout at the umpire because he felt he was being penalised more than his opponent was.
Despite having a two set lead overnight befoe the rain arrived, Opelka eventually went out 3-6 6-7 (3-7) 6-4 6-3 7-6 (7-5) to the 12th seed.
Svitolina 6-4 1-2 Boulter*
Unlucky for Katie Boulter when, at 15-30, she gets herself in a nice position for a winner and ends up rattling it into the top of the net.
Elina Svitolina can't quite find her range with her first serve but she holds as Boulter larrups a return long.
*Svitolina 6-4 0-2 Boulter
Jonathan Jurejko
BBC Sport at Melbourne Park
Looks like Heather Watson will be coming back tomorrow.
The British number two's opening match against Czech Kristyna Pliskova - twin sister of second seed Karolina - was due to be sixth on court 10.
But with the fourth match still going on, and another men's singles tie to come, Watson's match has been rescheduled.
Waiting for official confirmation on what exactly that means, but pushing back to Wednesday appears to be a strong possibility.
*Svitolina 6-4 0-2 Boulter
Svitolina blinks first in this latest rally and pops her forehand long.
Advantage, Boulter... and the Brit holds as Svitolina errs once again!
Svitolina 6-4 0-1 Boulter*
Long on the forehand from Boulter, and we're at deuce.
Svitolina 6-4 0-1 Boulter*
Boulter drops the first point but she sends a whippy forehand winner through for 15-15, and she's aided by the net as she passes Svitolina.
She tries a drop shot but Svitolina is one of the best movers on the tour and she gets the ball back in an awkward place, too awkward for Boulter to pop it home.
Oh, Boulter's nailed that drop shot, though, and Svitolina can only watch it float over the net.
40-30...
Svitolina 6-4 0-1 Boulter*
It's crucial for Katie Boulter to back up this break...
Svitolina 6-4 0-1 Boulter*
And Katie Boulter breaks!
She owns this latest rally, sending Elina Svitolina from corner to corner, and not even Svitolina can stop the last ball flying through her racquet.
*Svitolina 6-4 Boulter
Elina Svitolina coughs up a double fault for 30-30 and then Katie Boulter smacks a winner past her!
Hello, break point...
*Svitolina 6-4 Boulter
It'll be Elina Svitolina to get the second set under way.
Jonathan Jurejko
BBC Sport at Melbourne Park
Very little between these two, just a bit more quality - beautifully-constructed points and line-kissing winners - from Svitolina's side of the net.
Svitolina had won just three more points than her British opponent - until that brutal break to love which clinched the set.
Svitolina 6-4 Boulter
The sole break of the set came in the final game, with Katie Boulter gifting Elina Svitolina some second serves to have a look at.
Still, not a bad opening set for the Brit - but this is a tough, tough ask against a player as good as Svitolina.
Svitolina 6-4 Boulter
Judy Murray
Tennis coach at Melbourne Park on BBC Radio 5 live sports extra
Svitolina really stepped up but she was aided a bit by all the second serves for Boulter.