Serena Williams retires injured at 3-3 in first set against Aliaksandra Sasnovich
Williams appeared to be hurt when losing her footing in fifth game of match on Centre Court
Roger Federer into second round after Adrian Mannarino retires one point into final set
Mannarino could not continue after slipping on court late in fourth set - also on Centre Court
Nick Kyrgios v Ugo Humbert 3-3 in final set when 23:00 BST curfew ends play on day two
Coco Gauff beats GB's Francesca Jones 7-5 6-4
Top seed Ashleigh Barty overcomes Carla Suarez Navarro 6-1 6-7 (1-7) 6-1
Dan Evans defeats Feliciano Lopez 7-6 (7-4) 6-2 7-5
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*Federer 6-4 6-7 (3-7) 2-5 Mannarino
Some real venom off the strings of Adrian Mannarino at the moment. Roger Federer is struggling to get a bat on those serves. The Frenchman backs up his break with a snappy hold.
Tim Henman
Former British number one on BBC Two
Mannarino is playing some quality tennis. Aggressive on returns.
Keeps his nose ahead in this set.
When he broke before, Federer broke straight back. Can Mannarino consolidate?
Federer 6-4 6-7 (3-7) 2-4 Mannarino*
The Frenchman takes it on the first!
It's a snappy return and Roger Federer can only hook a forehand into the tape in response.
Adrian Mannarino breaks the grand master to love.
*Federer 6-4 6-7 (3-7) 2-3 Mannarino
And Adrian Mannarino has three break points...
Jones 1-0 Gauff*
Katie Falkingham
BBC Sport at Wimbledon
Coco Gauff and Fran Jones have met before, in qualifying in Adelaide in February. Gauff won in straight sets on that occasion, going on to reach the semi-finals.
It's a shaky start for Jones here. She saves two break points in the opening game to hold.
*Federer 6-4 6-7 (3-7) 2-3 Mannarino
Roger Federer wraps a backhand into the net. The start of that iconic swing has been there today, the result we're so accustomed to hasn't. He then leaks a forehand wide. 0-30.
#bbctennis
Joe: Is this really Federer? Cannot buy a simple forehand into the court right now. What has happened?
Image source, gett*Federer 6-4 6-7 (3-7) 2-3 Mannarino
Wow. What a sneeze from a crowd member. That one was heard from Centre Court to Wembley.
Meanwhile, Adrian Mannarino rattles his way to 40-0 and then holds. No messing.
Federer 6-4 6-7 (3-7) 2-2 Mannarino*
Roger Federer sweeps a love hold and it's all square in the third set.
Jack Draper, the 19-year-old Briton who took the first set against Novak Djokovic yesterday, has a message for us...
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Jonathan Jurejko
BBC Sport at Wimbledon
Just as I was checking when Federer last lost in the Wimbledon first round, the Swiss great lifts his spirits - and the majority of those watching on Centre.
Many in front of us leap to their feet and shake fists like they're on court themselves. Federer? Looks non-plussed as he figures out how to turn things back in his favour.
Back in 2003, by the way. It was that famous afternoon when 18-year-old Mario Ancic stunned him.
There are a number of rain-affected matches just about to resume, including that of Briton Jay Clarke.
Clarke currently trails world number 77 Egor Gerasimov of Belarus 6-3 3-6 7-6 (7-5).
Kiki Bertens, who will retire at the end of the season, is also about to resume, as is Canadian 10th seed Denis Shapovalov.
*Federer 6-4 6-7 (3-7) 1-2 Mannarino
Lovely stuff from Roger Federer. Drawing Adrian Mannarino from one side to the other and then knocking down a volley to win the point and give himself a third chance to break back in this game.
And this one he takes! Federer hits back immediately and we're back on serve in the third.
Federer 6-4 6-7 (3-7) 0-2 Mannarino*
No! Federer cups into the tape and Mannarino saves again. Deuce once more.
Image source, Getty Images*Struff 2-4 Medvedev
John McEnroe
Three-time Wimbledon singles champion on BBC TV
It's good tennis we're watching in this first set. The way these players can return now... that wasn't a pat-a-cake serve from Struff - he's just hit a serve at 132mph and it's come straight back at his feet. Medvedev has come out strong.
Federer 6-4 6-7 (3-7) 0-2 Mannarino*
Another chance for Roger Federer as Adrian Mannarino can't quite get over the line. Can he break back at the second attempt?
Federer 6-4 6-7 (3-7) 0-2 Mannarino*
What a shot! Adrian Mannarino leaps into a huge backhand from the baseline and it skips away from the eight-time Wimbledon champion. Deuce.
Federer 6-4 6-7 (3-7) 0-2 Mannarino*
Power and precision in the Adrian Mannarino serve when he needs it, a wrist-rattler that Roger Federer can do nothing about.
He gets to the next though, and that spells danger for the Frenchman. Federer takes this one to break point and gives a hint of a fist pump too.
Federer 6-4 6-7 (3-7) 0-2 Mannarino*
Brilliant all round. Adrian Mannarino thinks he's found the angle to unpick Roger Federer but the Swiss is already on his way forward a wriggles a perfect drop shot into the gap left by the Frenchman.
15-30. A sniff for the Swiss?
Jones v Gauff
Katie Falkingham
BBC Sport at Wimbledon
Coco Gauff and Francesca Jones are FINALLY about to get their first-round tie under way, they've just emerged onto court.
You'll remember Gauff's rapid rise to stardom at Wimbledon two years ago, when she - at the age of just 15 and a wildcard - beat Venus Williams in the first round and went on an amazing run to the fourth round.
Now 17, she returns to SW19 with two WTA singles titles to her name and a run to the French Open quarter-finals.
She faces Britain's Jones, who qualified for a Grand Slam for the first time earlier this year, playing at the Australian Open. What a moment for her as she makes her Wimbledon main-draw debut.