Harriet Dart jumps us back to deuce with a strong first serve.

But an error then gives Boulter another break point.

Harriet Dart defends well to recover from 0-30 to 30-30.

But Katie Boulter does then set up break point with a backhand winner that kisses the line. The momentum is properly with the British number one now.

Katie Boulter survives a scare by taking the next two points to check out with big a hold. The world number 30 is halfway there in the second set.

Fabulous defence from the third seed who has Dart running all over the court before finishing things off with a forehand winner.

Boulter hits a forehand long. A chance to break back for Dart. 30-40.

Harriet Dart senses a chance, going up 30-0, but Katie Boulter stays cool and composed, levelling at 30-30 with a fine forehand winner into the corner.

We're starting to race through these games now. Harriet Dart cruises to a comfortable hold to cut the deficit in the second set.

Finally, a hold of serve!

Katie Boulter ends the run of five consecutive breaks, racing to 40-0 and eventually steadying herself to hold to 30.

Katie Boulter, world number 30, finally converts, hitting a deep forehand winner on the approach into the corner.

The perfect way to bounce back from that tie-break loss.

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A fourth break point chance for Boulter at the start of the second set. Dart hits a backhand wide.

Saved again. Boulter strikes the net. Deuce.

Dart saves the next two points at the net though.

But then gifts another break point with a wide forehand error.

That first set took 64 minutes. It felt like a proper epic following it, with break after break.

Is this second set destined to go the same way? Katie Boulter races to 15-40 on Harriet Dart's serve with a fine backhand winner down the line.

Harriet Dart does take the first set at the first time of asking!

Katie Boulter tries a bit too much and hits a backhand long. The British number two has the advantage over the British number one.

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Dart finds her first serve. Boulter can't return it.

Set point Dart.

Will Katie Boulter get through Harriet Dart's defence to set up set point? She can't this time, hammering a shot into the net!

It's on a knife-edge.

The pair trade the next two points but again Harriet Dart shows her disapproval, unhappy with a long call against her.

Harriet Dart is frustrated, hitting a spare ball into the sky after she nets to give Katie Boulter a slender lead.

Boulter goes back level, getting down low to fire over a backhand winner at the net.

There's nothing in it at the changeover.

Katie Boulter gets on the board in the tie-break, with a fine serve winner and then a brutal forehand into the corner.