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 6-3 3-4 Kecmanovic
Jannik Sinner loses his footing again as he looks to return from the corner. It's his right foot that slides away and throws him off balance - the backhand return goes long for deuce.
Miomir Kecmanovic takes the next two points for the hold and it's a huge hold after saving three break points.
Image source, Getty ImagesSinner 4-6 6-3 3-3 Kecmanovic*
Mark Woodforde
17-time Grand Slam doubles champion on BBC Radio 5 Live
I'm surprised Sinner's rebounded as quickly as he has.
The fall did look awful live and then again in the replay, so much so the chair empire quickly got off the chair and security surrounded the court because they expected him to be slow getting up, but he really just dusted himself off.
It seems he hasn't been rattled by that tumble.
Zheng 6-7 (7-9) 6-2 6-7 (2-7) 2-1 Norrie*
Cameron Norrie runs hard to chase down a teasing forehand drop shot but Michael Zheng moves quickly up the court for a cross-court forehand winner. 40-15.
Zheng secures the hold with an ace.
Sinner 4-6 6-3 3-3 Kecmanovic*
Jannik Sinner gets another look at break as his forehand sends Miomir Kecmanovic into the corner and the Serbian's return is wide.
Sinner 4-6 6-3 3-3 Kecmanovic*
But Miomir Kecmanovic comes up with big serves just when it matters - leaving Jannik Sinner unable to return on both occasions for deuce.
*Zheng 6-7 (7-9) 6-2 6-7 (2-7) 1-1 Norrie
Leading 30-0, Cameron Norrie is pegged back to 30-all. A slightly timid net approach is deservedly punished by Michael Zheng, who waits for the Brit to pick a side before burying the winner in the opposite direction.
Zheng ends up stuck at the net himself on the next point, with Norrie peppering balls into his body. He parries back the first couple but is helpless as a powerful stroke pings off his racquet and out.
Norrie seals the hold with a forehand winner.
Image source, PA MediaSinner 4-6 6-3 3-3 Kecmanovic*
Jannik Sinner is flying now.
The Italian uses those leaver-like arms to hit a serve winner and get two sights at break point.
*Ostapenko 6-4 3-6 4-4 Dart
What a get from Harriet Dart!
Jelena Ostapenko looked to have won the point with a deft drop-shot, but Dart harries and gets there just in time to hit the pass winner.
It's hard to keep up with the momentum swings here.
We go from 40-0 to deuce, but two really big - and timely - first serves from Dart get her her first hold in this deciding set and we are level once again.
Sinner 4-6 6-3 3-3 Kecmanovic*
Jannik Sinner shrugs off any concerns that he is going to be impeded by that injury.
A hold to love keeps this third set on serve.
*Sinner 4-6 6-3 2-3 Kecmanovic
Andrew Castle
BBC Sport tennis commentator on BBC One
That is a great hold of serve from the Serbian from break point down.
I hope Jannik Sinner is OK. He isn't walking completely freely here, but he hasn't called for the assistance of his trainer at the change of ends.
Credit where it's due to Miomir Kecmanovic, who has shown he is a very consistent and high-level performer.
Image source, Getty ImagesOstapenko 6-4 3-6 3-2 Dart*
Emily Salley
BBC Sport at Wimbledon
I think the Court One crowd have long forgotten that they were supposed to be watching Emma Raducanu in the opening match.
Harriet Dart and Jelena Ostapenko are putting on a real show here and the fans are absolutely loving it.
The frustration has got to Ostapenko, though, and she holds her thumb up to the crowd in a sarcastic gesture, which earns her a bit of booing.
Dart, meanwhile, waves her arms up and down, calling for more noise.
Zheng 6-7 (7-9) 6-2 6-7 (2-7) 1-0 Norrie*
Michael Zheng unleashes a brutal forehand winner for 40-30 and closes out a routine hold to start the fourth set.
He appears to have shaken off the disappointment of that third-set tie-break quite swiftly.
*Sinner 4-6 6-3 2-3 Kecmanovic
Harry Poole
BBC Sport at Wimbledon
One minute Jannik Sinner was lapping up the love from the crowd, the next Centre Court fell silent as they waited to see if Jannik Sinner would manage to get himself back to his feet after what appeared a really nasty fall.
I'm sat behind the end of the court where Sinner hit the deck, and the way he went down looked incredibly awkward.
Thankfully, he appears to have been moving absolutely fine since.
*Sinner 4-6 6-3 2-3 Kecmanovic
Jannik Sinner has not called for the physio at the change of ends but there is a slight limp as he walks back to the chair - he did well to hide that in the latter stages of the game.
The Italian's legs just gave way as he tried to change direction midway through the game. It looked like his left leg was tangled under his body as he fell backwards.
Definitely one to keep an eye on.
Ostapenko 6-4 3-6 4-3 Dart*
You just can't keep Harriet Dart down!
She draws the errors from Jelena Ostapenko and for fourth time in this final set a double fault leads to a break of serve.
Ostapenko isn't happy with the crowd's cheers, but the home support are happy to see Dart back in this decider.
*Sinner 4-6 6-3 2-3 Kecmanovic
Jannik Sinner's mobility looks just fine as he strides up to the net and slaps away a winner for deuce.
There also doesn't appear to be any issue in generating power from turning through the left hip.
Miomir Kecmanovic goes on to get the hold though.
*Zheng 6-7 (7-9) 6-2 6-7 (2-7) 0-0 Norrie
Cameron Norrie brings up three set points but he only needs one as Michael Zheng goes long.
That was a tricky set at times for Norrie but he showed his experience in the tie-break.
Can the British 26th seed go on and secure the win from here?
Image source, PA MediaSinner 4-6 6-3 2-2 Kecmanovic*
Tim Henman
Former British number one on BBC One
Well I think can conclude that if Jannik Sinner is going to play drop shots against Miomir Kecmanovic, they have got to be on the backhand side.
That was magnificent. He wanted the recognition from the crowd as well.
Sinner 4-6 6-3 2-2 Kecmanovic*
Jannik Sinner gets the full attention of Centre Court as he finally pulls off a drop shot and it's a very special one too.
Sinner gets to the net and cuts the ball with the backside of his racquet. It lands just over the net and spins dramatically back towards him. Beautiful. Sinner raises his arm to accept the cheers from the crowd.
Ah, his celebrations are short-lived as he takes a tumble and Centre Court falls silent. Concerns over Sinner's left hip as he slips and looks very awkward on the floor. Sinner is back up and moving OK for now.
Image source, Getty Images*Ostapenko 6-4 3-6 4-2 Dart
The crowd are doing their best to lift a slightly disappointed looking Harriet Dart here.
She will have been frustrated to lose her break advantage twice.
But with a bit of fist pumping and shouting she manages to bring up game point.
Uh oh, a shot from Jelena Ostapenko that looked to be going long just catches the baseline by half a centimetre to bring up deuce.
And the Latvian takes the momentum from that to up her winner count and breaks Dart's serve once again.
Image source, Getty Images
