History is on the line on Arthur Ashe Stadium on Saturday as Flavia Pennetta and Roberta Vinci attempt to become the best late bloomer ever in the finals of the US Open.
With that in mind, here are 10 Things To Know about the US Open final - it's going to be a doozy!
(26) Flavia Pennetta (ITA #26) vs Roberta Vinci (ITA #43)
Head-To-Head: Pennetta leads Vinci, 5-4
1) These two might already be the best late bloomers in WTA history.
Flavia Pennetta, 33, and Roberta Vinci, 32, are the oldest first-time Grand Slam finalists in the Open Era, and whoever wins will be the oldest first-time Grand Slam champion in the Open Era.
2) They've also made history for Italy.
This is the first all-Italian Grand Slam final in the Open Era. In fact, this was already the first time in the Open Era that two Italians were in the semifinals of the same Grand Slam event together.
3) This is the oldest combined age Grand Slam final in the Open Era.
At 66 years and 19 days, this is the oldest combined age Grand Slam final in the Open Era. The previous oldest was 1977 Wimbledon (Virginia Wade and Betty Stove, 63 years and 11 months).
4) Don't let their current rankings fool you - both have been ranked much higher.
The No.26-ranked Pennetta has been ranked as high as No.10 before - she was in fact the first Italian to break the Top 10 (she's since been joined in that elite by Francesca Schiavone and Sara Errani). The No.43-ranked Vinci, meanwhile, was knocking on the door of the Top 10 - she's been No.11.
5) This was already Pennetta and Vinci's best Grand Slam.
Before this, Pennetta's best Grand Slam result was reaching the semifinals here in 2013 (falling to Victoria Azarenka) and Vinci's was reaching back-to-back quarterfinals here in 2012 and 2013.
6) Only six players ranked outside the Top 25 have ever won a Grand Slam.
That's Venus Williams (No.31 at 2007 Wimbledon), Barbara Jordan (No.68 at 1979 Australian Open), Serena Williams (No.81 at 2007 Australian Open), Chris O'Neil (No.111 at 1978 Australian Open), Evonne Goolagong (unr. at 1977 Australian Open) and Kim Clijsters (unr. at 2009 US Open).
7) Pennetta could break another record...
If Pennetta wins, she will have done it in her 49th career Grand Slam played - the longest wait of anyone to win their first Grand Slam title. Vinci is playing her 44th, which would come in at third place (Jana Novotna won 1998 Wimbledon in her 45th and Marion Bartoli won 2013 Wimbledon in her 47th).
Pennetta will set a new career-high if she wins the title.
The World No.26 is projected to rise to No.16 by reaching the final and to No.8 with the title.
9) Vinci is projected to return to her career-high if she wins the title.
The World No.43 is projected to rise to No.19 by reaching the final and to No.11 with the title.
10) The winner has a really good shot at Singapore...
Winning the US Open title would propel both Italians into the Top 8 on the Road To Singapore leaderboard, the year-long journey to the BNP Paribas WTA Finals Singapore presented by SC Global. Pennetta would shoot up to No.6, Vinci to No.7 - neither has played the WTA Finals in singles before.