Both players left the court at the end of that lengthy first set, so we've had a bit of a wait to get back under way.

Ah, here they are.

Same again, you'd imagine the expectant crowd are thinking.

Jonathan Jurejko
BBC Sport at Roland Garros

Now, I've got no idea what Svitolina was having eye drops for, but I certainly need some after wandering around Court Simonne Mathieu.

The charming court, set in a botanical gardens, is easy on the eye.

But the pollen from the surrounding greenery can play havoc with the conjunctiva if it triggers an allergic reaction.

Wild speculation, I know, but it certainly seems a potential and plausible reason.

Image source, BBC Sport

Alejandro Davidovich Fokina played some brilliant stuff in that first set, but he's made to start from scratch.

Let's hope he can maintain the level he has shown so far, because it's been a great watch.

But after 83 minutes, Djokovic has his first set point...

Sealed with a forehand.

Davidovich Fokina served for the opening set, and led the tie-break 3-1, but Djokovic finds a way.

Image source, Getty Images

Nicely done! Davidovich Fokina shows he is still very much alive in this tie-break, arrowing a backhand winner down the line to reduce the deficit.

Djokovic can sense his opportunity now.

He takes another point off the Davidovich Fokina serve, sending the Spaniard on the run at the back of the court.

Davidovich Fokina gets stuck into Djokovic's serve but the final touch is missing.

Djokovic takes charge on the Davidovich Fokina serve and eventually forces an error to move level at 3-3.

The crowd are really enjoying this one.

Those eye drops did the trick it seems.

Elina Svitolina levels it up against Anna Blinkova, winning the second set 6-2.

A decider is on the cards. Ninth seed Daria Kasatkina awaits the winner in the fourth round.

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Djokovic eventually folds under pressure from Davidovich Fokina, who has loosened up again here.

The third seed stays close by with a well-worked point, volleying in to an empty court for 2-3.

Davidovich Fokina crashes down a forehand to take the first point of the tie-break.

But he misses a great opportunity, needlessly rushing a forehand which drops into the net.

Another overhead ensures he hits the front again, though.

Davidovich Fokina saves the first with a huge forehand, but he narrowly misses the line to hand Djokovic the break back.

To a tie-break we go!

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Davidovich Fokina looks set to deliver a quick one-two punch with a powerful first serve out wide, but he can't follow it up.

Another miss from the Spaniard, who is getting tight at the wrong moment here.

Two break points for Djokovic.

Now, can Davidovich Fokina hold his nerve and take what would be a deserved first set, or will Djokovic force a tie-break.

The Serb expertly slices a low volley to take the first point.

A shake of the fist from Davidovich Fokina towards his box. He's done it again!

He breaks Djokovic for a second time - but he got quite the helping hand from the third seed there.

They could prove rather costly mistakes, with Davidovich Fokina now serving for the opening set.

Image source, Getty Images

Incredible.

Djokovic pulls himself level at 30-30 but yet another double fault in this game hands over a break point!

So, on we go in this gripping first set.

We've already had an hour of high-quality tennis on Court Philippe Chatrier. Can Davidovich Fokina continue to push Djokovic?

Wow! Consecutive double faults from the Serb, who looks to the sky in frustration.

He can't believe it. Davidovich Fokina probably can't either. 0-30.

Very, very well played.

Davidovich Fokina responds with an ace, before dragging former world number one Djokovic around the court and clinching the hold with another perfectly measured lob.

A defiant start from Davidovich Fokina, beginning his latest service game with an ace, but a couple of misses bring Djokovic to 30-30.

A big point here - and Davidovich Fokina is up to the task, forcing the error to relieve the immediate pressure.

It's not long before Djokovic is waving his arms to stir the crowd, however, as he reaches deuce with a backhand winner.

Russia's Anna Blinkova has raced through that first set 6-2 against Elina Svitolina.

The Ukrainian receives some medical attention for an eye problem before the second set.

Some eye drops seem to have done the trick as she breaks Blinkova's serve.