Final score: Ireland 19-17 Australia
Muldoon, Griffin & Spence scores tries as hosts edge win
Murphy, Parry, Samoa tries, Hewson con for Aus
Final score: Wales 12-44 New Zealand
Harries and Clay both cross for Wales but NZ run in eight tries
Final score: England 56-5 Spain
Wing Wilson leads the way with four tries as champions score 10 in all
Ireland 7-5 Australia
Orla Bannon
BBC Sport Northern Ireland in Dublin
Marie Louise Reilly's line-out steal has brought the biggest roar of the night from the Irish fans.
Could it be the spark to ignite their second half?
Ireland 7-5 Australia
The crowd are fired up now. They're really getting behind the girls in green and it's helped - Australia have lost a line-out.
Can Ireland capitalise? They're still camped in their own territory.
Sene Naoupu makes an inviting run but she's stopped in her tracks.
Ireland find some room on the right but they're soon crowded out again.
Image source, InphoIreland 7-5 Australia
Ireland's defence holds firm and they earn a scrum in their own half.
Centre Jenny Murphy's had to go off injured, she's been replaced by Katie Fitzhenry.
Ireland 7-5 Australia
Rebbeca Clough - on as a replacement for the Australians - drives her legs and tries to charge forward but she's grounded by the Irish defence.
It gets really messy as Australia try to build up another attack, starting from the centre of the field. The ball is pinging about all over the shop.
Ireland 7-5 Australia
Australia force Ireland back into their own 22 before they eventually kick clear.
As the Wallaroos try and string together another attack, there's a handling error from Grace Hamilton and Ireland have the scrum.
Now the hosts kick forward into the Australian 22... but Samantha Treherne holds it up.
This is so close.
Ireland 7-5 Australia
Off we go again. Katrina Barker - Australia's scrum-half - boots us into the second half.
England 56-5 Spain
England got their World Cup defence off to a storming start with a 56-5 victory over world number eight Spain.
Here's what captain Sarah Hunter had to say about their 10-try win.
Job done for England in World Cup opener - captain Hunter
Ireland 7-5 Australia
This was always going to be the closest contest of the day. It hasn't disappointed.
Ireland 7-5 Australia
The sun is blazing down in Dublin. It looks glorious out there.
Australia patiently build from left to right and gold shirts line up in attack.
But Ireland hold it up on the five metre mark and earn a scrum.
Ireland 7-5 Australia
Orla Bannon
BBC Sport Northern Ireland in Dublin
Ireland were energised by Muldoon's try but have got sucked into a sevens' style, loose kind of game - which is right up Australia's alley.
They have pace to burn out wide and showed it with Murphy's try.
The home crowd are nervous.
Image source, Getty ImagesIreland 7-5 Australia
There's no greater joy in rugby than seeing a hooker go on the charge down field. G'waaan, Cheyenne Campbell!
The Australian bulldozes through but the girls in gold are held up as Ireland hit them hard.
This is brutal.
Mahalia Murphy
Sevens-style showboating!
A quick line-out sees full-back Samantha Treherne send a looping ball over to winger Mahalia Murphy who steps Eimar Considine and steams over the line at full pelt.
The conversion is missed when the ball falls off the tee just as Treherne is about to kick it. Awkward.
Image source, InphoIreland 7-0 Australia
Australia waste their penalty chance. The line-out was a mess.
Ireland have possession but can't get out of their own half until they earn a penalty after a high tackle from fly-half Trilleen Pomare.
The Irish clear out.
Image source, Getty ImagesIreland 7-0 Australia
Australia want to get an immediate response and they earn a penalty for offside in a kickable position.
They go for the corner instead.
Larissa Muldoon (con Stapleton)
Ireland are inches from the line. It's a constant stream of pick and goes.
Finally... scrum-half Larissa Muldoon snipes and goes over! The crowd LOVED that.
Nora Stapleton lands an easy conversion between the posts.
Image source, InphoIreland 0-0 Australia
The referee stops play and goes to the TMO as he's spotted a potential infringement in the line-out.
He thought the Australian prop Hilsha Samoa might have taken out the Irish lifter, but after checking it a couple of times he's happy the girls in green were at fault for dropping their own player.
No foul. Australia earn a scrum in their own 22.
Ireland 0-0 Australia
Ireland are on the charge, they're 10 metres out from the try line.
Nora Stapleton feeds to her left but her pass has too much zip on it and not enough height so Alison Miller can only knee it and it goes into touch.
Image source, Getty ImagesIreland 0-0 Australia
Orla Bannon
BBC Sport Northern Ireland in Dublin
This has been understandably quite a nervous start by Ireland.
The hosts had targeted a good start but they have barely been out of their own half so far.
The crowd chant 'Ireland, Ireland' to try and get them going.
Image source, Getty ImagesIreland 0-0 Australia
Ireland celebrate like they've scored as they overpower Australia at the scrum in their own 22. They really enjoyed that little battle.
The Irish try to clear their lines but get it all wrong and Australia push forward once again.
But now the hosts regain possession. As Claire Molloy attempts to run forward, she's smashed by Australia wing Nareta Marsters.
That looked painful.
Ireland 0-0 Australia
Sharni Williams finds a gap in the Ireland defence and dances through, but the Australia attack is continuously held up.
Trilleen Pomare tries to grubber-kick to a gold shirt cross-field but Ireland full-back Hannah Tyrrell gets there first.
Image source, Getty Images