Sydney Sixers are due to face Melbourne Stars in the Big Bash League final at the Sydney Cricket Ground on Saturday.
However, heavy rain is forecast all day in Sydney, casting doubt on whether the Twenty20 match, set to start at 08:15 GMT (19:15 local time), will go ahead.
A minimum of five overs per side need to be played to constitute a full game and there is no reserve day.
If the final is washed out, the Sixers will be crowned champions after beating the Stars in the qualifier round.
The Sixers won by 43 runs to claim the right to host the final before the Stars beat Sydney Thunder by 28 runs in Thursday's challenger round to set up a rematch.
It would be the Sixers' first title since winning the inaugural competition in 2011-12, while the Stars have never won the Big Bash.