Federer & Djokovic through to second round after opponents retire
Women's top seed Kerber & Pliskova also through
Wozniacki beats Babos in day's last Centre Court match
Edmund beats Alex Ward but Boulter, Klein & James Ward are out
Watch Today at Wimbledon on BBC Two at 20:30 BST
*Federer 4-3 Dolgopolov
Huge cheers from Centre Court as Roger Federer lands a glorious forehand return to a 90 mph serve.
Then the third seed sends a forehand right on to the white lines to make it 30-30.
A break point goes amiss for the Swiss, but he has another opportunity after deuce. Dolgopolov survives again.
Eventually, the Ukrainian world number 84 holds. He's being tested here, though.
#bbctennis
Alice Stainer: Delighted that Del Potro is through, but very much enjoyed both game and attitude of Thanasi Kokkinakis. One to watch I think.
Emma Davies: Wimbledon means I literally get nothing done for two weeks
Federer 4-2 Dolgopolov*
A more than comfortable hold for Federer, who finishes off with back-to-back aces again.
Ace.
Image source, EPABoulter 6-3 5-7 McHale
Chance for McHale at 15-30 on Boulter's serve - the Briton is scrambling here and the American duly puts her away with a arcing forehand winner.
Two more set points for McHale. She fires long as Boulter saves the first.
She can't save the second though, scrambling again but McHale is up at the net and in control as Boulter eventually misfires on the volley.
The wildcard player came all the way back but it counts for little now.
Into the decider we go...
Tim Henman
Former British number one on BBC TV
Dolgopolov always relies on his defensive skills and grass is the hardest surface to defend on. Also, with that strapping on his ankle you wonder if it will restrict his movement.
Image source, EPA*Federer 3-2 Dolgopolov
Dolgopolov hits a line judge's anatomy with a first serve and the crowd wince in unison.
How do the line judges not flinch when a tennis ball comes at them at a million miles an hour? I'd scream like a banshee and wave my arms around in pain.
Anyway, Federer has another break point but the Swiss can only net a forehand. Deuce.
Dolgopolov takes the advantage and holds when Federer fails to return in the lines.
Pliskova 6-1 Rodina
Karolina Pliskova, favourite to win Wimbledon, looks set for a straightforward passage into the second round.
Pliskova has just taken the first set against Russian Evgeniya Rodina 6-1.
The Czech is striking the ball cleanly and smoothly and meeting very little resistance from Rodina.
Federer 3-1 Dolgopolov*
Federer comes under a bit of pressure on his serve from the quick-thinking Dolgopolov.
But he recovers to 40-30 with back-to-back aces and holds after his opponent sends a shot way over the baseline.
Image source, EPA*Boulter 6-3 5-6 McHale
Hawk-Eye is back working on court 12 and is in McHale's favour this time as she races to win that service game to love.
Can Boulter take it to a tie-break?
Image source, Getty Images
Anna Thompson
BBC Sport at Wimbledon
Yolanda Fernandez and her 10-year-old son Juan Pablo Orosco have travelled from Mexico to watch the tennis. She is a huge Roger Federer fan while Juan Pablo is backing Rafael Nadal.
She said: "This is my third time at Wimbledon. It is wonderful and huge.
"It's Juan Pablo's first time. He watched Rafa practice today and he signed his cap so he is already very happy."
Image source, BBC Sport*Federer 2-1 Dolgopolov
Alexandr Dolgopolov pleases the crowd with a delectable forehand winner at the net and then adds an ace. Ooohs and aggghs all around.
Federer claws back to 40-30, but places a backhand long over the line. The world number 84 gets off the mark.
Boulter 6-3 5-5 McHale*
Strange goings on court 12 - McHale is convinced that a ball called out has dropped in and wants to challenge.
Only, there's been a Hawk-eye malfunction. They can't get the replay and so the original call stands.
The American is fired up and swinging - she levels at 15-15 but tightens up and Boulter makes it 30-15 then 40-15.
The Briton then belts a late backhand into the net but a fantastic deep backhand winner levels it at 5-5. Boulter was 2-5 and a set point down. What a comeback.
*Zverev 6-4 2-2 Donskoy
Alexander Zverev has never lost a first-round match at Wimbledon in three appearances at SW19.
He's made a good start over on court three today The number 10 seed has taken the first set against Russia's Evgeny Donskoy.
Federer 2-0 Dolgopolov*
Federer on serve in his 70th Grand Slam event.
After trailing 15-30, the third seed recovers and sees out the game by overpowering Dolgopolov with a big serve.
*Federer 1-0 Dolgopolov
Oooh, an early break opportunity for Federer after a Dolgopolov double fault.
But the seven-time champion can't capitalise and we go to deuce.
A sublime Federer forehand gives the Swiss the advantage, and Dolgopolov slams into the net to hand Fed the game.
Ominous.
*Boulter 6-3 4-5 McHale
Boutler takes it to her opponent with a well-controlled high volley to set up break point on the McHale serve.
An unfortunate mis-hit takes it back to deuce but she forces McHale to fire wide and here's another break point.
Boulter gets behind the serve and her chipped return drops just over the net - McHale can't get there in time and, from seemingly nowhere, Boulter is firmly back in this second set.
She'll serve next to level.
Federer 0-0 Dolgopolov*
We are back in action on Centre Court!
Dolgopolov to serve first.
Boris Becker
Three-time Wimbledon champion on BBC TV
Roger Federer speaks five languages, he has the full monty. He is not only the best player but a very intelligent man.
Boulter 6-3 3-5 McHale*
Good response from Boulter to prevent McHale running away with this set as she pulls off another impressive hold of serve on the back foot.
The wildcard has at least forced the American to serve for the set.
Image source, Reuters#bbctennis
Alice Stainer: Delighted that Del Potro is through, but very much enjoyed both game and attitude of Thanasi Kokkinakis. One to watch I think.
Emma Davies: Wimbledon means I literally get nothing done for two weeks
Line judge taking some punishment