A rubbish time to come up with Heather Watson's first double fault of the match. 3-3.

A perfectly disguised drop-shot from Watson restores her lead. 3-2.

The crowd seem to be warming to Ymer now, offering him moral support as he runs all over the place after the bullets Djokovic is raining down from across the net.

It doesn't help much, though and Djokovic gets another break. He'll be serving for the set next.

The first set is at the hour-mark and could go either way. Two-two in the tie-break.

Naomi Cavaday
BBC Radio 5 Live Sports Extra commentator

Heather Watson is looking sharp, she has everything covered. OK, Ferro got to that drop shot in time but Watson closed down the angle. When Watson is playing well everything looks so effortless.

Watson pulls a backhand wide. 2-1 to her in the tie-break.

Fiona Ferro misjudges a drop shot and that's 1-0 for Watson, which becomes 2-0 with a backhand winner down the line.

Great fighting spirit from Heather Watson, who has to dig deep to fend off three set points. Tie-break time.

A drop shot winner from Watson after she had to go very wide with an earlier forehand down the line. An eight-minute game. Watson hanging on to the first set.

Woah.

Mikael Ymer gets the Philippe Chatrier crowd on their feet and even elicits applause from Novak Djokovic as he chases a lob and plays it backwards through his legs. It lands perfectly in the corner, out of the top seed's reach.

He may ultimately be on track for a straight-sets loss, but at least the Swede will get to be a hero of tennis social media for a day.

Djokovic has held serve, by the way.

Heather Watson takes too long with her first serve. But she quickly regains her composure and Ferro wastes her third chance as she goes long.

But a forehand hit too hard from Watson gives Fiona Ferro her third set point.

Ferro into the net with a forehand after Watson had to go on the defensive to stay in the rally. Two set points saved. Deuce.

A superb serve from Heather Watson saves one set point. One still on the table. 30-40

Two set points for Fiona Ferro. 15-40

And we're back on track.

Ymer can only get one point in on his own serve. He hits a forehand long to give Djokovic the break and put the top seed ahead one more.

A drop shot from Ferro is reached by a galloping Watson, but Ferro can then send a winning passing shot and she is two points from the first set. 0-30.

David Law
BBC Radio 5 Live Sports Extra tennis commentator

Fair play to Mikael Ymer who made Djokovic work a little bit harder. Maybe he will start to feel a little more settled.

A perfectly weighted backhand down the line is a great way to end the 11th game from Ferro. Heather Watson had to serve to stay in the first set not long ago and has to do the same again now.

This wasn't in the script. A couple of sloppy mistakes from Djokovic mean Ymer has two break points.

The Serb's backhand drop-shot doesn't make it over the net and his Swedish opponent has broken back.

It does feel like more of a hiccup from the top seed rather than a turning of the tide, though.

Image source, Reuters