On what has been a wet and windy night at Parc y Scarlets, Wales proved too much for Greece.
Sophie Ingle, Kayleigh Green, Ceri Holland (2) and Tash Harding got Wales' goals on the night as they move top of Group I - temporarily at least.
France will regain top spot by closing out victory against Kazakhstan, they currently lead 4-0.
All focus now goes to Tuesday's crucial clash between France and Wales in Guingamp.
Gemma Grainger will be delighted with what she's seen tonight, but next week's match will be a completely different test.
Post update
Wales 5-0 Greece
After winning the corner it's Rhiannon Roberts who wins the header.
But despite making a couple of errors in the first half, Greece goalkeeper Anthi Papakonstantinou makes a great save to keep the score at five.
Post update
Wales 5-0 Greece
There will be a minimum of three minutes of time added on in Llanelli.
Can Wales pinch a sixth late on?
Rhiannon Roberts wins the ball back - again - and wins a corner. The defenders are up.
Green voted player of the match
Wales 5-0 Greece
Former Wales international Gwennan Harries has picked Kayleigh Green as today's player of the match.
As well as scoring Wales' second, Green was influential from the first minute and caused the Greek defence all sorts of problems.
A worthy winner.
Post update
Wales 5-0 Greece
The game has lost a little tempo in the last few minutes, but Wales remain totally comfortable in possession.
It's been a very professional performance from Gemma Grainger's side tonight, one which has delighted the rather damp crowd in Llanelli.
Post update
Wales 5-0 Greece
The crowd at Parc y Scarlets rise and applaud at the 85th minute to mark 10 years since the death of Gary Speed.
Highlight: Harding heads in a fifth for Wales
Wales 5-0 Greece
Post update
Wales 5-0 Greece
Jo Price
Former Wales goalkeeper on BBC Radio Wales
A well deserved ovation for Jess Fishlock. She is a heroine in Wales, on and off the pitch.
Post update
Wales 5-0 Greece
With goal difference playing a part in the group stages, and Estonia putting six past Estonia earlier today, Wales will not take their foot off the gas in these closing stages.
Jess Fishlock has a shot blocked as she drives into the box as Wales sense a sixth.
But that is Fishlock's final say in the match, as she's replaced by Charlie Estcourt.
Post update
Wales 5-0 Greece
Jo Price
Former Wales goalkeeper on BBC Radio Wales
Exciting play from Megan Wynne, that's what she does well is run at players.
All they can do is watch her dancing feet.
Post update
Wales 5-0 Greece
Incredible skill from Megan Wynne down the Wales right, she beats two Greece defenders with ease before chipping a cross the back post which is just about dealt with.
Lovely play from Wales.
Highlight: Holland gets her second
Wales 5-0 Greece
97 not out for Ward
Wales 5-0 Greece
Helen Ward edges closes to her 100th cap, as she comes on for her 97th appearance in a Wales shirt.
She comes on with Megan Wynne, with Kayeligh Green and Tash Harding making way - perhaps with an eye to the France game next week.
There are more changes for Greece too, as Grigoria Pouliou and Christina Kiamou come on for Sofia Kongouli and captain Eleni Kakambouki.
Big chance!
Wales 5-0 Greece
Carrie Jones is already impressing.
From a similar position to Ceri Holland's second goal, Jones goes for power but Anthi Papakonstantinou makes the save.
The rebound however falls to Tash Harding just a couple yards out, but with her weaker left foot she puts an effort just wide.
Changes for both sides
Wales 5-0 Greece
Ceri Holland could have had a hat-trick on another day, but her evening is over as she's replaced by 18-year-old Carrie Jones.
The Manchester United youngster already has five caps for her country, but she'll be looking to get her first goal in the final 20 minutes this evening.
Greece also make a change, Dimitra Karapetsa on for right-back Vasiliki Giannaka.
Post update
Wales 5-0 Greece
Jo Price
Former Wales goalkeeper on BBC Radio Wales
Natasha Harding cannot stop scoring.
The initial ball out wide from Jess Fishlock was brilliant, then the cross from Rhiannon Roberts and a great header from Harding.
What a performance!
GOAL - Wales 5-0 Greece
Tash Harding
It's a great team goal for Wales, and while Tash Harding gets the credit for the goal a big chunk of that should go to Rhiannon Roberts.
The full-back makes a brilliant run down the Wales right and picks out a perfect back-post cross for Harding.
Harding has to be brave to put her head in between Greek defenders, but she gets the decisive touch and a well-deserved goal.
Live Reporting
Philip Marsh
All times stated are UK
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Latest PostThank you, diolch, and good night
FT: Wales 5-0 Greece
Thank you for joining us this evening, hopefully you've been warmer than the players and fans at Parc y Scarlets tonight.
Wales did what they needed to, claiming victory while adding to their goal difference in the process.
Player of the match Kayleigh Green said the performance was "fantastic" as she scored her fourth goal of qualifying.
You can read Michael Pearlman's report on the match here.
Thanks again, we'll see you on Tuesday for Wales crucial match against France. Until then!
Post update
FT: Wales 5-0 Greece
Jo Price
Former Wales goalkeeper on BBC Radio Wales
You can never complain with five goals.
I could name so many brilliant performances but Ceri Holland was superb for me.
It has set them up well for a very different test against France on Tuesday.
FULL-TIME - Wales 5-0 Greece
Job done for Wales.
On what has been a wet and windy night at Parc y Scarlets, Wales proved too much for Greece.
Sophie Ingle, Kayleigh Green, Ceri Holland (2) and Tash Harding got Wales' goals on the night as they move top of Group I - temporarily at least.
France will regain top spot by closing out victory against Kazakhstan, they currently lead 4-0.
All focus now goes to Tuesday's crucial clash between France and Wales in Guingamp.
Gemma Grainger will be delighted with what she's seen tonight, but next week's match will be a completely different test.
Post update
Wales 5-0 Greece
After winning the corner it's Rhiannon Roberts who wins the header.
But despite making a couple of errors in the first half, Greece goalkeeper Anthi Papakonstantinou makes a great save to keep the score at five.
Post update
Wales 5-0 Greece
There will be a minimum of three minutes of time added on in Llanelli.
Can Wales pinch a sixth late on?
Rhiannon Roberts wins the ball back - again - and wins a corner. The defenders are up.
Green voted player of the match
Wales 5-0 Greece
Former Wales international Gwennan Harries has picked Kayleigh Green as today's player of the match.
As well as scoring Wales' second, Green was influential from the first minute and caused the Greek defence all sorts of problems.
A worthy winner.
Post update
Wales 5-0 Greece
The game has lost a little tempo in the last few minutes, but Wales remain totally comfortable in possession.
It's been a very professional performance from Gemma Grainger's side tonight, one which has delighted the rather damp crowd in Llanelli.
Post update
Wales 5-0 Greece
The crowd at Parc y Scarlets rise and applaud at the 85th minute to mark 10 years since the death of Gary Speed.
Highlight: Harding heads in a fifth for Wales
Wales 5-0 Greece
Post update
Wales 5-0 Greece
Jo Price
Former Wales goalkeeper on BBC Radio Wales
A well deserved ovation for Jess Fishlock. She is a heroine in Wales, on and off the pitch.
Post update
Wales 5-0 Greece
With goal difference playing a part in the group stages, and Estonia putting six past Estonia earlier today, Wales will not take their foot off the gas in these closing stages.
Jess Fishlock has a shot blocked as she drives into the box as Wales sense a sixth.
But that is Fishlock's final say in the match, as she's replaced by Charlie Estcourt.
Post update
Wales 5-0 Greece
Jo Price
Former Wales goalkeeper on BBC Radio Wales
Exciting play from Megan Wynne, that's what she does well is run at players.
All they can do is watch her dancing feet.
Post update
Wales 5-0 Greece
Incredible skill from Megan Wynne down the Wales right, she beats two Greece defenders with ease before chipping a cross the back post which is just about dealt with.
Lovely play from Wales.
Highlight: Holland gets her second
Wales 5-0 Greece
97 not out for Ward
Wales 5-0 Greece
Helen Ward edges closes to her 100th cap, as she comes on for her 97th appearance in a Wales shirt.
She comes on with Megan Wynne, with Kayeligh Green and Tash Harding making way - perhaps with an eye to the France game next week.
There are more changes for Greece too, as Grigoria Pouliou and Christina Kiamou come on for Sofia Kongouli and captain Eleni Kakambouki.
Big chance!
Wales 5-0 Greece
Carrie Jones is already impressing.
From a similar position to Ceri Holland's second goal, Jones goes for power but Anthi Papakonstantinou makes the save.
The rebound however falls to Tash Harding just a couple yards out, but with her weaker left foot she puts an effort just wide.
Changes for both sides
Wales 5-0 Greece
Ceri Holland could have had a hat-trick on another day, but her evening is over as she's replaced by 18-year-old Carrie Jones.
The Manchester United youngster already has five caps for her country, but she'll be looking to get her first goal in the final 20 minutes this evening.
Greece also make a change, Dimitra Karapetsa on for right-back Vasiliki Giannaka.
Post update
Wales 5-0 Greece
Jo Price
Former Wales goalkeeper on BBC Radio Wales
Natasha Harding cannot stop scoring.
The initial ball out wide from Jess Fishlock was brilliant, then the cross from Rhiannon Roberts and a great header from Harding.
What a performance!
GOAL - Wales 5-0 Greece
Tash Harding
It's a great team goal for Wales, and while Tash Harding gets the credit for the goal a big chunk of that should go to Rhiannon Roberts.
The full-back makes a brilliant run down the Wales right and picks out a perfect back-post cross for Harding.
Harding has to be brave to put her head in between Greek defenders, but she gets the decisive touch and a well-deserved goal.
Post update
Wales 4-0 Greece
Another great crowd at Parc y Scarlets this evening.
4,055 fans have braved the weather conditions and they've been treated to a brilliant performance so far.