Lives and rugby careers will be changed overnight this weekend as the nail-biting, spine-tingling, nerve-shattering series between Robbie Deans' Qantas Wallabies and Warren Gatland's British & Irish Lions reaches its climax in front of an expected crowd of 84,000.
Picking a winner is virtually impossible given the Lions won the first Test by two points and the Wallabies the second by one. The fact that both games could have been won by the losing team with an 81st minute penalty merely proves the point you can't put a cigarette paper between the two teams.
Deans' reaction to the challenge of trying to hold on to the Tom Richards trophy for the next 12 years has been to recall the veteran flanker George Smith in the only change to the side that triumphed 16-15 in Melbourne. Smith is the only survivor from the Australian team that clinched the last series against the Lions in 2001 with a dramatic victory at the same Sydney venue 12 years ago.
Will muscle memory, and an awesome ability at the breakdown, turn the returning, and thereafter departing, Smith into a national hero? It is one final farewell for the 110 cap flanker, but will it turn him into only the eight player in history to become a double series winner against the Lions?
Gatland's final roll of the selectorial dice was been rather more dramatic this week. He removed his only veteran from 2001, Brian O'Driscoll, as he followed up his five changes from the winning team in the first Test for the second with a further half-a-dozen for the Sydney finale.
He has gone with what he knows best, picking a record equalling 10 Welshman. The last time the Lions did that was for the first Test against the Wallabies in Brisbane in 1950 - it worked, and the Lions won!
The fit-again Jamie Roberts joins one of the stars of the tour, Jonathan Davies, in the midfield to try to add more thrust, Mike Phillips returns at scrum half and No 8 Toby Faletau earns his first Test cap in a back row that also features Ireland's abrasive Sean O'Brien in place of the injured captain Sam Warburton.
So what have the Lions got to do to wake up on Sunday morning drinking champagne and feeling like champions? Not an awful lot more than they have managed in the opening two games - just a little bit longer and with greater consistency.
In Brisbane the line-out was fantastic, the scrum dominated in the first half and there were six line breaks and two tries. Leigh Halfpenny only missed with one kick, yet the penalty count was high and the breakdown a lottery.
A week later in Melbourne the breakdown improved significantly, the defence was water-tight until the 77th minute and the penalty count dropped. The line-out was once again a great source of primary possession and the scrums eventually evened themselves out.
But there was no real threat behind the scrum and the Lions' relied on the boot of their impeccable full back, Halfpenny, to try to haul them over the line. He kicked five out of seven for all 15 points, but couldn't perform the miracle needed to win the game with his 55 metre shot with the last kick of the game.
The Lions have poured unprecedented amounts of financial and human resource into ending their 16 year wait for a series win. It is still well within their grasp, but they will have to win more of what assistant coach Rob Howley described as the 80 one minute battles than they did last week, especially in the second half.
They have to create more chances and make more of them when they come along. In a game that will predictably be as tight as its two predecessors the team that makes the most of its moments will prevail. It is going to be huge, it is going to be memorable and there will be much agony before anyone can enjoy the ecstasy of holding aloft the Tom Richard Trophy.
WHAT THEY ARE SAYING
"The question for Australia is, can they get themselves emotionally up for this game. I'm not sure that they can do that. It's hard to get yourself completely on the edge every week and I think that had to be it last week when you saw the reaction of James Horwill after the game and what it meant.
"We're disappointed and we think emotionally we can improve for it but there's a question whether they can do the same thing."
"This doesn't come around again. At the final whistle it's archived. You've heard the players talk about it because of the scarce nature of the event and you've heard players who have experience it in the past and come up short how it lingers with them. The players understand that, it's important for the game. They only get one crack at it. It's important for the game, the nation and, most importantly, it's important to the individuals."