Novak Djokovic overcomes China's Wu Yibing 6-4 5-7 6-4 6-4 in gruelling Centre Court battle to reach Wimbledon second round
British men's number one Cameron Norrie loses in five sets to qualifier Michael Zheng - one of 10 home players to lose on opening day
Jack Draper pulled out of championships because of arm injury to join Emma Raducanu on sidelines
Men's champion Jannik Sinner overcomes Miomir Kecmanovic in five-set thriller
Women's top seed Aryna Sabalenka beats Teodora Kostovic 6-2 6-3
*Sinner 4-6 4-2 Kecmanovic
After a rocky start to the second set, Miomir Kecmanovic has gone back to what helped him win the first - playing aggressively at the net.
Kecmanovic sprints to the middle to challenge Sinner and it works as the Italian's forehand is straight into the net for 30-15.
Jannik Sinner's forehand strays long and Kecmanovic has a chance to break back.
*Ostapenko 6-4 3-6 0-0 Dart
She can!
It looked a little bit nervy when Ostapenko took the first point, but some lovely serving from Harriet Dart sees her see out the game and take this match into a third set.
It has been really gutsy from the Brit to turn this around on Court One.
Image source, Getty Images*Zheng 6-7 (7-9) 6-2 2-3 Norrie
Unforced errors are still hampering Cameron Norrie's game but some accurate first serves wins him the points to secure the hold.
*Ostapenko 6-4 3-5 Dart
Jelena Ostapenko has only dropped two points on her serve since bring broken in this second set and quickly now asks the serve-it-out question of Dart.
Can the British number five hold her nerve to level this match?
Draper out of Wimbledon
Naomi Broady
Former British player on BBC Radio 5 Live
It's awful news for British tennis fans at Wimbledon - the time of the year everyone wants to be playing their best tennis and so many of our best players aren't even able to walk on to the court to play it.
For Jack especially, and similarly with Emma Raducanu, the amount of injuries that have kept them out for the last year or so and not enabled them to build up to matches and feel match tight and show what they're capable of doing.
*Sinner 4-6 4-2 Kecmanovic
Miomir Kecmanovic holds his nerve and gets the hold.
Jannik Sinner is unable to get firmly behind a powerful serve and it lands well beyond the baseline.
Zheng 6-7 (7-9) 6-2 2-2 Norrie*
So, even more British hopes resting on Cameron Norrie's shoulders after that Jack Draper announcement.
The British 26th seed is up against it a bit as Michael Zheng rockets a forehand winner to secure the hold.
Norrie could only stand and admire that one.
Image source, Getty ImagesSinner 4-6 4-1 Kecmanovic*
The response from Jannik Sinner to losing the opening set has been very much as you'd expect - he's playing with much greater urgency.
Sinner gets to 30-15 against serve but is pegged back to 30-30.
The Italian goes for a drop shot but it's not convincing and Miomir Kecmanovic sends away a passing shot to lead. Any celebrations are short-lived, though, as Sinner gets to deuce.
Image source, Getty Images*Ostapenko 6-4 2-5 Dart
Emily Salley
BBC Sport at Wimbledon
Harriet Dart is entertaining the fans out on Court One. Just when you think she's about to be broken, she comes out of nowhere and somehow fends off the break points.
Jelena Ostapenko has had seven chances to strike in this second set, but she hasn't converted any of them and the frustration is showing.
*Ostapenko 6-4 2-5 Dart
A cleaner game from Jelena Ostapenko as she peppers the corners and holds to love - the first time that has happened in this match.
It looks like the world number 31 has found a bit more focus here as she powers her way to a 40-15 on Harriet Darts serve.
The Brit does not know when she is out, though, as she rallies herself and forces Ostapenko to have to hit those extra shots.
It works and Dart is now one game away from levelling this match.
Image source, Getty Images*Zheng 6-7 (7-9) 6-2 1-2 Norrie
Michael Zheng comes through his service game with a convincing hold with Cameron Norrie unable to make any inroads.
Cameron Norrie then speeds through his service game with a hold to 15.
It's really tough to predict which way this match could go at the moment and I wouldn't be surprised if it went to five sets.
Sinner 4-6 4-1 Kecmanovic*
Jannik Sinner gets his latest hold to love as he quickly closes in on levelling this match at one set apiece.
Sinner turns to his coaching box and raises his racquet to celebrate.
Ostapenko 6-4 2-4 Dart*
Martina Navratilova
Nine-time Wimbledon singles champion on BBC Two
Harriet Dart has been battling on her serve every service game, and she is struggling now Jelena Ostapenko has cleaned up her game.
She isn't making the errors she was making earlier - and that has given her a number of break points here.
Jack Draper has pulled out of Wimbledon due to a recurrence of an injury in his left serving arm.
The British number five was due to face sixth seed Taylor Fritz in the first round on Centre Court on Tuesday.
In a statement, Draper said: "Devastated to share that I have had to withdraw from my first round match due to a recurrence of my arm injury.
"There have been a lot of painful moments in the last 12 months but this one is definitely the absolute worst as there is no greater honour for a British player than playing at Wimbledon.
"I will continue to persevere through this. Thank you for the support!"
Draper reached the semi-finals in Eastbourne last week in the lead up to Wimbledon - his first tournament since April.
Image source, Getty Images*Sinner 4-6 3-1 Kecmanovic
After winning the opening set, Miomir Kecmanovic has lost three games in succession - he really needs to address that now to stand any chance of staying in this set.
The Serbian moves into a 40-0 lead and goes on to get the hold to 15 when Jannik Sinner's backhand flies long.
Still too many unforced errors from Sinner.
Image source, Getty ImagesClick 'Get Involved' to have your say
The Sinner match is giving me flashbacks to Federer's struggle against Alejandro Falla in 2010. Nothing better than an underdog giving it some on Centre Court!
Stefan
*Zheng 6-7 (7-9) 6-2 0-1 Norrie
That is just the start Cameron Norrie needed in this third set as he wraps up the game with a big first serve out wide with Michael Zheng can't get back into play.
Sinner 4-6 3-0 Kecmanovic*
Jannik Sinner is charging on now and gets a hold to love to consolidate that break.
It's not too warm at Wimbledon today but the Italian wraps a huge ice-packed towel around his neck at the change of ends just to regulate his temperature.
Image source, Getty Images*Ostapenko 6-4 1-4 Dart
Martina Navratilova
Nine-time Wimbledon singles champion on BBC Two
Jelena Ostapenko looks to be keeping her cool, but she will be boiling on the inside.
Harriet Dart is hanging on in there and making her miss her shots - she is in her head a little bit here.
Dart knows how to play on this court, moves really well, makes people hit more balls than they would like to and takes advantage of her opportunities. She is playing the big points better in this second set.
Image source, Getty ImagesZheng 6-7 (7-9) 6-2 0-0 Norrie*
Naomi Broady
Former British player on BBC Radio 5 Live
It's not looking great for Norrie.
Zheng is up to 70% of his first serves and he's only dropped three points when he has landed that first serve so he's able to get the first strikes in the rally and it's taking the big shots away from Norrie whose winner count has dropped drastically.
16 winners in the first set and just five in the second.
