Sofia Kenin beats women's seventh seed Coco Gauff 6-4 4-6 6-2
Venus Williams loses to Elina Svitolina after nasty slip on Centre Court
GB's Liam Broady, Jan Choinski and Jodie Burrage through, but Harriet Dart and Katie Swan go out
GB's Dan Evans loses first two sets to Quentin Halys on Court Two before bad light ends play
Men's champion Novak Djokovic defeats Pedro Cachin in straight sets to reach second round
Women's world number one Iga Swiatek beats Zhu Lin 6-1 6-3
Halys 5-2 Evans*
What a sliced backhand on to the chalk from Quentin Halys.
He's zoned in while Dan Evans is allowing himself to be frustrated, distracted and annoyed.
A double fault yields 0-30 - and a backhand winner down the line brings up three set points for Halys.
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Joe: Whoever wins the match between Coco Gauff and Sofia Kenin can go very deep in the tournament - the standard has been so good today.
Halys 5-2 Evans*
Goodness me, the power in Halys' serve is something to behold.
From 0-30 down he pounds in four massive serves - in between a frustrated Evans is given a formal warning by the umpire for an audible obscenity.
*Halys 4-2 Evans
Indeed, Evans has found renewed vigour after that hold - a booming forehand followed by a huge shout of 'COME ON' as he brings up 0-30 on the Frenchman's serve.
*Halys 4-2 Evans
Jess Anderson
BBC Sport at Wimbledon
Dan Evans does not cut a very happy figure at the moment, shaking his head and muttering to himself and the umpire.
The Brit has been vocal about his struggles this year and it looks at times like he's struggling to kerb those negative thoughts in his opening match.
Having said that, a solid hold for 4-2 will be a good confidence booster, as will the crowd shouting "come on Danny boy!"
Kenin 6-4 4-6 0-0 Gauff*
Long again from Sofia Kenin, she's broken for just the second time today. Coco Gauff forces a decider on Court One.
Image source, Getty Images*Kenin 6-4 4-5 Gauff
How are your nerves? Sofia Kenin goes long with a simple forehand. Advantage and set point for Coco Gauff.
Halys 4-2 Evans*
Is that a possible turning point for Dan Evans in this opening set?
Had he gone 5-1 down the set was over but he smashes down two aces and a third unreturnable serve to turn break point into a hold.
Halys 4-1 Evans*
John Lloyd
Former GB Davis Cup captain on BBC TV
Evans is checking out his group, giving them the old verbals. Not the team's fault you had a bad service game. At the moment the Frenchman is on fire.
The first job you have to do is manage your own service game and hope your experience takes you through.
Halys 4-1 Evans*
Dan Evans has lost his past five matches on the ATP Tour - and right now, you can tell.
A flicked forehand into the corner of the court rescues Evans an important point from 15-30 down but he just cannot find his first serve and that is bringing pressure.
*Kenin 6-4 4-5 Gauff
It's heated. Coco Gauff punched the air as she holds with an ace.
Sofia Kenin will serve to stay in the second set.
Image source, Getty ImagesHalys 4-1 Evans*
Dan Evans in deep conversation, from a distance of course, with his coaching team at the changeover after he missed a couple of opportunities in that Halys service game to threaten a break back.
This opening set is slipping away from the Brummie.
Hanfmann 4-6 6-2 6-4 0-0 Fritz
Potentially another shock brewing on Court Three?
Taylor Fritz, the men's ninth seed, has just lost the third set to Germany's Yannick Hanfmann and is now two sets to one behind.
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Natalie: Brilliant from Jan Choinski! A star is born! First victory at a grand slam.
Halys 3-1 Evans
John Lloyd
Former GB Davis Cup captain on BBC TV
I think Evans needs to make sure his first serve percentage is quite high, because his second serve is getting punished.
Halys is playing aggressive tennis here. He's anxious to get in when he can - he's come out here, taking the ball and going for it. Very impressive performance by the Frenchman.
Kenin 6-4 4-4 Gauff*
Back on Court One and we're racing towards the end of the second set. Both Americans Coco Gauff and Sofia Kenin have just held pretty comfortable service games.
Who will blink first?
*Halys 3-1 Evans
But while Choinski celebrates, it's not going so well for Dan Evans.
A double fault does not aid his cause on the way to a loss of serve.
Choinski 5-7 7-6 (7-4) 6-2 6-2 Lajovic
Arguably the result of Jan Choinski's career - on his Grand Slam debut.
The 6ft 5in Briton has come from a set down to beat world number 56 Dusan Lajovic to the delight of all on Court 17.
Image source, PA MediaHalys 2-1 Evans*
John Lloyd
Former GB Davis Cup captain on BBC TV
I love Evans' variety. He's not a tall man by today's standards, doesn't have a big serve but he uses all different parts of the game.
I think he is in the top five in the world as a volleyer. He can change the game around and a lot of players don't like playing him when he's playing well, because he can throw so many things at you.
Halys 2-1 Evans*
Not looking like there's going to be many long rallies in this match - and as if to rubber-stamp that notion, Quentin Halys bangs down two huge aces to hold serve.
Both players going big here - is the time of night they are starting having anything to do with that? Neither will want to have to come back tomorrow to finish matters, one imagines.