On Saturday, the Bledisloe and on Sunday, the Socceroos.
Auckland's Eden Park will host a tasty trans-Tasman weekender next month, when the Wallabies visit the All Blacks' house of pain, and Graham Arnold's side play their last match before heading to the World Cup.
For fans, it's a superb double act.
It could also be the Wallabies' best chance at regaining the Bledisloe Cup for the first time since 2002 given the All Blacks' recent wobbles.
However, for the Socceroos, there are fears the surface could scotch the occasion, raising injury risk just weeks out from Qatar.
The Socceroos will play on the same field 19 hours after the Wallabies, and if it's a wet weekend in Auckland, it could spell disaster.
Rugby union and football coexist very uneasily in the sporting calendar given they often share stadia but have different turf requirements.
Rugby needs longer grass than football, where players need confidence in the pitch to turn quickly, or whiz the ball across the surface.
Football coaches have long been frustrated by chopped-up turf from rugby scrums and mauls at multi-use pitches.
A-League venues in Sydney, Melbourne, Brisbane, Perth and Wellington face the issue, with tricky cross-code fixturing efforts made to avoid this situation.
Football New Zealand chief executive Andrew Pragnell said they were aware of the challenge and would rise to it.
"We've got every assurance from the park management that it's totally capable of doing that," he told AAP.
Eden Park chief executive Nick Saunter, an Australian who has worked at Marvel Stadium, said the turf will be cut between the two fixtures to improve the pitch for football.
Sources at A-League clubs using multi-use stadia say the cross-code challenge is dwarfed by concerts or monster trucks.
That problem will play out at AAMI Park just days before the A-League Men's opening fixture between Western United and Melbourne City in October.
The sources agreed the rugby-football dilemma came into play during the wet.
"It's only a problem if it rains. Then it is a real problem," one club boss told AAP, saying the injury potential was real.
The last A-League match at Eden Park was played during a big wet, with players slipping over at will and Steven Ugarkovic botching a penalty on the soaked turf.
And worryingly, under the same La Nina conditions as Australia, New Zealand has just recorded its wettest July on record.
Still, there is plenty of incentive for New Zealand Football to get the pitch right and put on a show.
The All Whites haven't played at home for five years, and the series is celebrating 100 years from the first trans-Tasman international, won by New Zealand in Dunedin.
Both sides should be at full strength, with Pragnell saying NZF would call up their highest profile players in the only FIFA-sanctioned window left before the World Cup.
He admitted "significant commercial" benefits to play at Eden Park.
"We want our games and our players to be visible and present to a whole range of audiences," Pragnell said.
"We considered playing elsewhere.
"Eden Park is our largest capacity stadium. It's got a really interesting history as well and for this historic moment, it made sense ... to play the largest capacity venue."
Saunter said he was hoping for close to 100,000 fans across the weekend "of trans-Tasman rivalry at its finest" with up to 10,000 travelling from Australia.
"There is no doubt in my mind that the fans and the community will be the real winners, regardless of the outcome on the field," he said.
The Bledisloe Cup Test is on Saturday September 24 at 7pm (5pm AEST), before the All Whites host the Socceroos on Sunday September 25 at 4pm (2pm AEST).
