Vancouver, Salzburg and the South Korean city of Pyeongchang will find out on Wednesday which of them will host the 2010 Winter Olympics.
Salt Lake City hosted a spectacular Winter Olympics in 2002
The decision is set to be made in Prague during the 115th International Olympic Committee session.
Vancouver is the favourite, having received praise from the IOC last month but Salzburg is a strong contender thanks to Austria's experience in staging winter sports events.
Pyeongchang is pinning its hopes of a surprise win on the promise of a united Korean team.
Olympic insiders believe Vancouver could clinch victory at the first stage of voting if, as is widely expected, most or all of Europe's 55 members vote for the Canadian city in a move to open the way for a European bid for the Summer Games in 2012.
London, Paris and Moscow have already launched bids for the Games.
They could be expected to vote for a non-European city for 2010 in order to protect their 2012 bids.
Vancouver had an unsuccessful bid for the 1976 Winter Games but the Vancouver bid committee are quick to play down their status as favourites this time around.
"We know we've done a great job but all the cities have done a great job - the IOC has a very difficult decision to make," said Sam Corea, a spokesman for the Vancouver 2010 Bid Corporation.
Pyeonchang's 100-member delegation have promised one final publicity charge hoping to turn their city's lack of world recognition into a strength.
In Austria, the Olympic Games would be something
"The reason why the media are saying Pyeongchang has very
little chance in the bid is probably because it is not as well known as Vancouver and Salzburg," Kim Jin-sun, Governor of Kangwon and president of the bid committee, told Reuters.
"If we win the Olympic Winter Games in 2010 it will serve as an impetus for developing winter sports in the Asian region," Kim said.
Salzburg has drawn on the support of several sporting luminaries to help plug its case.
"Austria is the best place for an Alpine skier: the races here are simply incredible, the spectators euphoric and the organisation well done," said US skier Bode Miller, a double silver medallist at the last Games in Salt Lake City.
"Here the Olympic Games would be something extraordinarily special," the New Hampshire-born racer added.