Jelena Jankovic and Serena Williams have to wait until Sunday to meet in the US Open final with the added incentive of the WTA's world No.1 ranking along with the final grand slam title of 2008.
The final was scheduled for Saturday night but was postponed after the remnants of Tropical Storm Hanna dumped rain and strong winds on the New York area.
The weather also delayed the completion of the men's semi-final between Andy Murray and Spain's world No.1 Rafael Nadal, with the Scotsman leading 6-2 7-6 (7-5) 2-3.
When the women's decider is held, it will only be the ninth time a grand slam final will also determine the top spot in the WTA rankings.
The No.1 ranking will change hands in Flushing Meadows because Serbian star Ana Ivanovic was knocked out of the tournament in the second round.
The last grand slam final to feature two women battling for the world number one was the 2004 Australian Open where Justin Henin beat Kim Clijsters.
It has been 13 years since the top spot has changed hands in a grand slam final. Germany's Steffi Graf beat Arantxa Sanchez-Vicario in the 1995 Wimbledon final to regain the World No.1.
Both Jankovic and Williams have held top spot before but Serena is the more decorated of the two having held it for 57 weeks beginning in July 2002.
Williams is enjoying a resurgence in her game while Jankovic made it to her first grand slam final in 21 tries.
"I am putting in the effort both on and off the court," said Williams who hasn't been to the US Open final in six years.
"Doubles helped too. I am playing a lot more and having more consistent results."
Getting to her first final is a huge relief for Jankovic.
Before she beat Elena Dementieva 6-4 6-4 in Friday's semi-final she had been considered the best player to never make it to a grand slam final.
"I really want to do this and I think it's about time for me to make that step forward to break that barrier and go a long way," said Jankovic who held the No.1 spot for just a week last month.
"I want to win a grand slam and this is why I came here."
This will be the seventh career meeting between Jankovic and Williams with each winning three times. Williams won their last meeting earlier this year in Miami 6-1 5-7 6-3.
They have never met in a final before but Jankovic has won both times they squared off in a semi-final in Los Angeles (2006) and Dubai (2005).
