With that in mind, here are 10 Things To Know about the French Open final - it's going to be a doozy!
1) Serena is a win away from some major milestones.
Not only is Serena a win away from becoming just the third player in tennis history, male or female, to win 20 majors (after Margaret Court's 24 and Steffi Graf's 22) but she's also trying to become the first player to win three straight majors since herself back in 2002 and 2003 (when she won the Serena Slam) and the first player to win the Australian-French Open double since 2001 (Jennifer Capriati).
2) Serena could miss another major milestone by just nine days.
At 33 years and 254 days, Serena could miss the record for oldest woman to win a major in the Open Era by just nine days - Martina Navratilova won Wimbledon in 1990 at age 33 years and 263 days. But Serena's already got the second-oldest locked in from the Australian Open (33 years and 127 days).
3) Speaking of getting better with age, Safarova has waited a long time for this chance.
If Safarova wins, she'll have the third-most majors played before winning one, Open Era - this is her 40th. Marion Bartoli won her 47th (2013 Wimbledon) and Jana Novotna her 45th (1998 Wimbledon).
4) Safarova is going to soar up the WTA Rankings and Road To Singapore.
Safarova is guaranteed to surpass her previous career-high ranking of No.11 after this. She's projected to go from No.13 to No.7 if she loses today and to No.6 if she wins. She'll also soar up the Road To Singapore leaderboard, from No.14 to No.5 if she loses today, and all the way to No.4 if she wins.
5) Serena's lead at the top is just getting bigger and bigger...
Serena will stay No.1 on the WTA Rankings and Road To Singapore leaderboard. If she wins today, she'll have a 4,421-point lead over No.2 on the WTA Rankings - over two Grand Slams' worth of points.
6) Safarova is the fifth lefty to reach a Grand Slam final in the Open Era.
Only four other left-handers have reached a Grand Slam final in the Open Era - Ann Jones, Martina Navratilova, Monica Seles and the current No.1 lefty in the world, soon-to-be-World No.2 Petra Kvitova.
7) Serena does pretty well for herself against lefties.
Serena's got a nifty 61-10 career record against lefties in WTA-level main draw matches. Only one lefty has beaten her at a Grand Slam - Ekaterina Makarova in the fourth round of the 2012 Australian Open.
8) One has had the tougher road to the final... kind of.
Serena has had to rally from a set down an incredible four times in her six matches en route to the final, while Safarova hasn't even lost a set all fortnight. But perhaps surprisingly, Safarova has actually spent more time on the court than Serena - 10 hours and 23 minutes to 9 hours and 59 minutes.
9) Safarova is looking for the biggest win of her career.
Safarova has beaten World No.2s on three occasions, but she's 0-5 against World No.1s - one loss to Dinara Safina, one loss to Caroline Wozniacki and three losses over the last few years against Serena.
10) Serena has never lost to Safarova, but will red clay make a difference?
Serena has beaten Safarova in all eight previous meetings, including both previous clay court meetings, but both of those were on the green clay of Charleston - this is their first meeting on red clay.