Neither of these two can buy a service game right now.
To me, to you, to me, to you.
Who knows where we'll be when the duff duff duffs start...
Boulter 7-6 (7-4) 1-6 4-3 Tomljanovic*
Katie Boulter is hoping for a very dull season-finale here as she looks to see out the match from this position.
But wait, cue the dramatic music...
Boulter drops a shot into the net for a fourth successive break of serve - and sixth in seven games in the decider. What is going on?!
*Boulter 7-6 (7-4) 1-6 4-2 Tomljanovic
Over on court five, Sonay Kartal and Jodie Burrage have just lost a marathon first-set tie-break against Erin Routliffe and Lyudmyla Kichenok 10-8.
On Andy Murray Arena, Katie Boulter eyes the latest soap-worthy plot-twist as she gets stuck in to Ajla Tomljanovic's latest game.
And, after setting up the opportunity, Tomljanovic gifts the break with a double fault!
Boulter 7-6 (7-4) 1-6 3-2 Tomljanovic*
Jess Anderson
BBC Sport at Queen's
More twists and turns than Eastenders in this one.
Just when you think one has the momentum it's wrestled back to the other side of the court.
It's not over til it's over and all that.
Boulter 7-6 (7-4) 1-6 3-2 Tomljanovic*
Another whiplash-inducing twist in this final set rollercoaster.
Ajla Tomljanovic abruptly halts Katie Boulter's recently-found momentum with perhaps her best game of the match so far, in the context of the improving level of her opponent.
That's the break back as the clock hits the two-hour mark.
*Boulter 7-6 (7-4) 1-6 3-1 Tomljanovic
If I have taken anything from the past few days in the world of tennis, it is an even greater appreciation for the sport's scoring system.
It is never over until the handshake.
*Boulter 7-6 (7-4) 1-6 3-1 Tomljanovic
Few saw this coming three games ago!
Katie Boulter makes it two breaks of serve in succession to wrestle control of the decider, as Ajla Tomljanovic takes her turn to fall off her level - at the worst possible time.
Boulter is in the ascendancy and the crowd are back involved now as they urge the British number one on to the finish line.
Boulter 7-6 (7-4) 1-6 2-1 Tomljanovic*
Now Katie Boulter looks back in business!
The Briton backs up her breakthrough with a hold of serve to love, having struggled on serve for a huge chunk of this match. The momentum appears to have swung once more.
*Boulter 7-6 (7-4) 1-6 1-1 Tomljanovic
Jess Anderson
BBC Sport at Queen's
Finally something for the home crowd on Andy Murray Arena to shout about!
A big response from the Briton and the crowd return the favour.
*Boulter 7-6 (7-4) 1-6 1-1 Tomljanovic
Seemingly from nowhere, Katie Boulter wins a third straight point to get a look at a first opportunity for a long time.
Got it!
Cheers from the crowd, a big shout and a shake of the fist from Boulter. There is the moment she desperately needed.
Boulter 7-6 (7-4) 1-6 0-1 Tomljanovic*
Ajla Tomljanovic is getting all the luck now, too.
A shot clips the net cord and bounces in for the Australian as she gets clear on serve, before burying a powerful two-handed backhand into the corner for game point.
But Katie Boulter manages to claw her way back to deuce. How she could do with a break here.
Boulter 7-6 (7-4) 1-6 0-1 Tomljanovic*
What contrast this is to the smiles and celebrations in Katie Boulter's opening doubles victory alongside Emma Raducanu yesterday.
This has turned into such a struggle for Boulter. She battles back to deuce but Ajla Tomljanovic just won't relent, making the breakthrough in the decider.
That's six games in a row now for the Australian since 1-1 in the second set. It's become one-way traffic.
*Boulter 7-6 (7-4) 1-6 0-0 Tomljanovic
Another double fault for Katie Boulter. It hands over two break points.
The crowd get behind the British number one.
*Boulter 7-6 (7-4) 1-6 0-0 Tomljanovic
Kate Boulter needs to rediscover her first serve, first and foremost.
But she begins the third set with a double fault.
*Boulter 7-6 (7-4) 1-6 0-0 Tomljanovic
It took Katie Boulter more than an hour to capture the opening set.
With a closing ace, Ajla Tomljanovic settles the second in just half an hour to take us to a decider on Andy Murray Arena.
Tomljanovic barely had to get out of second gear there. Boulter must reset and start afresh.
Boulter 7-6 (7-4) 1-5 Tomljanovic*
Jess Anderson
BBC Sport at Queen's
Things have spiralled rapidly for Katie Boulter in set two.
Even the crowd are struggling to find something to help the Briton back into this.
She just hasn't managed to find her groove and there's surely no way back for the British number one.
A case of focus on the next one.
Boulter 7-6 (7-4) 1-5 Tomljanovic*
There's surely no way back in the second set for Katie Boulter from here.
Ajla Tomljanovic is looking unshakeable as she storms towards the set, taking a first break point opportunity as Katie Boulter struggles to rediscover her rhythm.
*Boulter 7-6 (7-4) 1-4 Tomljanovic
Ajla Tomljanovic is in charge on Andy Murray Arena.
The Australian has lost just four points across her three service games in set two as she swiftly holds serve to 15 to open up a 4-1 lead.
No way through for Katie Boulter at the moment. Plenty for the British number one to ponder at the change of ends.
Boulter 7-6 (7-4) 1-3 Tomljanovic*
Ajla Tomljanovic's fightback continues to gather pace.
The Australian forces a couple of break points and, after Katie Boulter saves the first with a body serve, the Briton misses to concede. Boulter has a real scrap on her hands here against a dialled-in opponent.
*Boulter 7-6 (7-4) 1-2 Tomljanovic
Ajla Tomljanovic isn't going anywhere here. The Australian, who is till climbing her way back up the rankings after taking time out to undergo surgery last year, holds serve comfortably to force Katie Boulter to continue playing catch up in this second set.