NEW YORK, NY, USA - Two days after becoming the first player to qualify for the BNP Paribas WTA Finals Singapore presented by SC Global, Serena Williams is looking to become as legendary as a pair of WTA legends by winning the US Open title. But there's a huge threat in the final, someone who almost beat the World No.1 twice during the lead-up - a former World No.1, Caroline Wozniacki.
They're good friends, two of the fiercest competitors on the tour and two of the biggest names in women's tennis, and they're about to go to battle. Here's 10 Things To Know about the final.
1) Serena leads Wozniacki in their head-to-head, 8-1, but that's deceptive.
The head-to-head seems lopsided but four of Serena's victories were three-setters, including both meetings this year in Montréal (watch the highlights above) and Cincinnati (highlights here).
2) Serena's going for some Grand Slam history here.
If she wins, Serena will have six US Opens, tying her with Chris Evert for most in the Open Era, and it will also be her 18th Grand Slam, tying her with Evert and Martina Navratilova for second-most Grand Slams in the Open Era. Steffi Graf currently has the Open Era record with 22 Grand Slams.
3) She's also going for some prize money history.
If she wins, Serena will receive a $4 million payout, the largest payout in tennis history, men's or women's. That's made up of $3 million for winning the title plus $1 million for winning the Emirates Airline US Open Series. Serena herself and Rafael Nadal had the previous record of $3.6 million.
4) Wozniacki will be back in the Top 10 no matter what.
Wozniacki has spent a total of 235 weeks inside the Top 10 in her career, including 67 weeks at No.1, but she has been out of the elite since the Australian Open fortnight this year. That will change on Monday - she'll go from No.11 to No.9 with a runner-up finish and No.11 to No.7 with the title.
5) Wozniacki could shake a tag that has been looming over her for a while now.
Wozniacki has a very strong case for best player never to win a major - more weeks at No.1 than any other player never to win one (67 - the next-highest is Dinara Safina with 26) and more WTA titles as well (22 - the next-highest is Pam Shriver with 21). Can the Dane get the monkey off her back?
6) Serena's trying to three-peat at a WTA event for just the second time.
Serena's only won one WTA event three years running before - Miami in 2002, 2003 and 2004. She's also trying to become just the second player in the Open Era to three-peat at the US Open, having won it the last two years already - Evert was the first, actually winning four straight from 1975 to 1978.
7) Serena would be the second-oldest player in the Open Era to win a Grand Slam.
Serena, 32, would be just the second player aged 32 or over to win a Grand Slam title in the Open Era. Navratilova won Wimbledon in 1990 - her 18th and last Grand Slam title - as a 33-year-old.
8) The No.1 seed has won a lot more Grand Slams than the No.10 seed - A LOT more.
Of the 186 previous Grand Slams in the Open Era, only once has a No.10 seed won the title - Justine Henin at the 2005 French Open. That's 0.5%. By contrast, No.1 seeds have won 76 of them (40.9%).
9) And this No.1 seed has a lot more experience in Grand Slam finals than this No.10 seed.
Serena is playing in her 22nd Grand Slam final and has a 17-4 record in her first 21 (the losses coming to Venus Williams at the 2001 US Open and 2008 Wimbledon, Maria Sharapova at 2004 Wimbledon and Sam Stosur at the 2011 US Open). Wozniacki is 0-1 (losing to Kim Clijsters at the 2009 US Open).
10) But both have been on absolute fire this summer.
Since the tour switched to hardcourts after Wimbledon, both of these players have been in ridiculous form - Serena is 18-1 (losing only to Venus in Montréal) and Wozniacki is 19-3 (losing only to Serena in Montréal and Cincinnati and to WTA Rising Star Camila Giorgi in the early rounds of New Haven).