Thanks to the eight-hour time difference, it will be a very different experience watching Wales play Australia on Sunday morning.
Instead of having all day to build up to crunch match, it kicks off at 8.45am UK time.
Victory for Wales would put them in pole position to come top of their group and set up a potential quarter-final against France or Argentina.
But if the Wallabies claim a 14th win from the last 15 starts against Wales, then Gatland's men could find themselves hurtling towards a last-eight appointment with England.
Wales have not claimed a Rugby World Cup success against Australia since 1987, when they won a third place play-off encounter 22-21 in Rotorua, New Zealand.
And there are plenty of places in Cardiff opening early so fans can watch the drama of this game unfold. We've also rounded up the spots in Swansea where you can grab a fry-up and a pint for the game – you can see those by clicking here.
Here are some of the venues in Cardiff which are open:
Brewhouse & Kitchen , Sophia Gardens
The Sophia Gardens pub is opening early for all of Wales' games and have a special breakfast menu on offer, including a Brunch Burger served in a cross between a croissant and a roll.
Big Drop 0.5% IPA on draught will also be on offer.
For parties of six or more, they are asking for a deposit of £5 per person.
The Beverley
The Cathedral Road pub is offering breakfast deals and all the rugby on a big screen.
Offers include £5.75 for a breakfast bap and drink of your choice, of £4.75 if you decide on a soft drink. You can also get a large breakfast and drink for £11.
Tables can also be booked here.
Tramshed
You can watch all the action of the Wales Rugby World Cup matches on their big screens and experience the new breakfast club.
Tickets are £5 for which staff will reserve your space and guarantee you a tea/coffee and breakfast roll to enjoy during the match.
The bar will also be available and they open two hours before kick-off.
Coyote Ugly
As well as all the Wales games, the bar on Cardiff's St Mary Street will be open for other opening games. All the action will be screened live on the big screen.
Table bookings are available.
Brains pubs
A large number of Brains pubs around the city will be showing the Wales games.
A spokesman for the brewery said: "We’re not running any specific offers for these games at the moment however there will be some breakfast menus available as well as our new Rugby World Cup beer on sale at selected pubs named Rising Sun, brewed with Japanese Sorachi Hops to cheer on the boys in Japan!"
Here is a list of pubs showing the game:
33 Windsor Place
Admiral Napier, Canton
Albany, Roath
Barocco, city centre
Birchgrove, Birchgrove
Black Lion, Llandaff
Blackweir Tavern, Cathays
Cambrian Tap, city centre
Cardiff Cottage, city centre
City Arms, city centre
Clifton, Splott
Coopers Carvery, Ely
Cornwall, Grangetown
Cross Inn, Rumney
Crwys, Roath
Duke of Wellington, city centre
Elevens, city centre
Fairwater, Fairwater
Fox & Hounds, St Mellons
Fox & Hounds, Whitchurch
Goat Major, city centre
Halfway, Cathedral Road
Heath, Heath
Hollybush, Cyncoed
Lewis Arms, Tongwynlais
Malsters, Whitchurch
Newbridge, Rumney
Old Arcade, city centre
Pear Tree, Roath
Pendragon, Thornhill
Plough, Whitchurch
Retreat, Llanedeyrn
Salt, Cardiff Bay
Tafarn Treganna, Canton
The Dock, Cardiff Bay
Three Arches, Heath
Three Horse Shoes, Gabalfa
Ty Nant, Morganstown
Victoria Park, Canton
Yard Bar & Kitchen, Cardiff city centre
Local rugby clubs
Rhiwbina Recreation Club, Lon-y-Dail, Rhiwbina, is open for all the Wales games and the knock-out games. On Sunday, it will be open from 8am and breakfast will be served.
Llandaff North Ruby Club , Radyr Road, Llandaff North, will open at 8am on Sunday for the game.
Whitchurch Rugby Club , Samuels Crescent, will be open in plenty of time for the 8.45am kick off. The bar will be open and there will be bacon rolls for £5 and a full breakfast for £7.
Llandaff Rugby Club , Western Avenue, will be showing the game on multiple screens. Doors open at 8am, bar opens at 8.30am and breakfast rolls for £2.50 will be served at half time.
Wetherspoon
Pubs are not opening early for the pre-6am matches but pubs will be showing the rugby when the pub is open at the discretion of the manager.
* If you are open, and aren't included, let us know by emailing katie.sands@walesonline.co.uk
