Russell Fuller
BBC tennis correspondent in Paris

"It's remarkable to think Serena Williams won her first Grand Slam in the previous century: the 1999 US Open. The big question mark is, how fit is she? She's struggling with an adductor injury, and Garbine Muguruza is playing very well. But Muguruza still has to be the underdog."

Image source, AP

Nana K: Serena does not need to win to prove she's the best, we all know she's the best ever in modern tennis even at 34...

John McEnerney: Serena will dig deep today and we know where the inspiration is coming from. SW in 3.

Garbine Muguruza and Serena Williams walk out on Philippe-Chatrier Court to a great fanfare.

Fourth seed Muguruza is wearing her favoured yellow dress, while world number one Williams has gone for royal blue with matching oversized headphones.

Both receive a huge bunch of flowers from the ball boys. Stick them in some water, lads. The ladies have got some tennis to be getting on with. 

Image source, AP

Paris has never experienced so much rain in May since records began in 1873, but somehow the French Open has managed to stay on schedule for the final two days.

Conditions look gloomy in the French capital on Saturday, but looks like the rain will hold off this afternoon. 

Good news.

Earlier today, Britain's Gordon Reid lost to Argentina's Gustavo Fernandez in the men's wheelchair singles final at the French Open.

The 24-year-old Scot had been bidding for a second Grand Slam singles title of the year after his Australian Open victory in January.

But Reid lost 7-6 (7-4) 6-1 to a player ranked two places below him in the world at six.

But he still has a chance of winning a title later in the day in the doubles.

As ever, we want to hear from you. Can Serena be considered the best ever if she wins today? Does Garbine Muguruza have a chance of stopping her? And indeed, any other weird and wonderful tennis musings that come into your heads...

Let us know via the usual channels - tweet #bbctennis, or text 81111 (UK only).

Is anyone else wondering how Serena Williams fits all her trophies on her mantelpiece?

Today could be the day she equals Steffi Graf's incredible record of 22 Grand Slam singles titles. 

And if Williams successfully defends her title, the 34-year-old will become the oldest ever French Open winner. 

BBC Radio 5 Live

As if the beautiful word-pictures that we'll be painting in this live text aren't enough, you can also listen to live commentary of this match courtesy of our friends at Radio 5 live.

Russell Fuller and former Wimbledon champ Jana Novotna are on the mic for this one. You can listen by clicking the Live Coverage tab at the top of the page, or tune in the old-fashioned way via the wireless.

Serena Williams beat Garbine Muguruza in straight sets to win the Wimbledon title in 2015 but it was a very different story when the pair met the year before.

Muguruza, who was 20 at the time and had only played 13 major matches, stunned Williams in the second round of the 2014 French Open by winning 6-2 6-2.

It remains Williams' heaviest slam defeat. 

Image source, Getty Images

After two weeks of forehands, backhands, dropshots, volleys, half-volleys, grunts, cheers, jeers, rain, rain, rain, some more rain, and a bit more rain, the French Open is drawing to a close.

Today we find out who will be named Queen of Roland Garros.

Will Serena Williams keep on reigning (every pun intended)? Or will Garbine Muguruza steal her crown?

Image source, Getty Images