GB's Dan Evans loses to Federer 4-6 2-6 2-6 on Centre
Play will be held on Sunday to clear backlog
Djokovic 6-7 1-6 Querrey when rain stopped play
GB's Tara Moore loses 1-6 6-2 3-6 to Kuznetsova
Serena Williams beats Christina McHale 6-7 6-2 6-4
V.Williams 1-0 Kasatkina*
Although Court Two has its covers back on, we're under way on Court One.
Venus Williams, five-time champion and eighth seed, holds her first service game against Daria Kasatkina of Russia.
What's this we hear? Boos and hisses over on Court Two as the covers come BACK ON again.
There's no rain falling so perhaps just precautionary but the expectant fans waiting for Nick Kyrgios v Dustin Brown are not happy about it.
Especially the Aussies in the crowd here to support Kyrgios, who are making a right din.
Image source, Getty ImagesDel Potro 3-6 Wawrinka
John McEnroe
Three-time Wimbledon singles champions on BBC TV
In some ways I am saddened by what I have seen. I am pulling for Del Potro and every player in the locker room is. No player deserves what he has had in last three or four years.
But you see him hit that backhand and there is just nothing on it.
Image source, Getty ImagesDel Potro 3-6 Wawrinka
Image source, .Del Potro 3-6 Wawrinka
Stan Wawrinka holds off break point to nab the first set here on Centre Court against Juan Martin del Potro.
The little Swiss pumps his fist and displays a chuffed look on his face.
Venus Williams looks less than psyched up as she makes her way to Court One for her match with Russian 29th Daria Kasatkina.
The American five-time champion stretches into an almighty yawn before striding out into the open air.
Somewhere between that level of laidbackness and climbing the wall like Joe Hart would seem to be optimum.
Del Potro 2-5 Wawrinka
Lindsay Davenport
Former Wimbledon champion on BBC TV
Wawrinka has got such a big game, heavy shots, backhands and serves.
His backhand is an amazing shot, it won him the French Open and he has the slice which works so well on grass.
If he is able to come to the net a bit more it could be a big factor here.
Image source, Getty Images*Del Potro 2-5 Wawrinka
Juan Martin del Potro - with a forehand like a giant trebuchet - clatters his way to a service hold. But the Argentine is playing catch up in the first set - he is a break down.
#bbctennis
Those are umbrellas coming down rather than going up...
Wawrinka 0-0 Del Potro
John McEnroe
Three-time Wimbledon singles champions on BBC TV
This is as big a second round match as you will see in a Slam, no question.
Image source, BBC SportWawrinka v Del Potro
Lindsay Davenport
Former Wimbledon champion on BBC TV
Del Potro has been playing more tournaments and spent more time on court which is a good sign but does he have the confidence on the big points to rip his two-handed backhand?
It is great to see him back but even better if he is able to play at the level of a few years ago.
Cheers around the grounds as the courts are unwrapped from their duvets and opened out to the air.
The court surface can get sweaty under there so it may be a little time before the players are summoned from the locker room to give it another bash.
Image source, Getty ImagesFinally, like a mirage in a desert, there are some players knocking about a ball on the Wimbledon grass.
Stan Wawrinka has won the Australian and French Opens but has never been beyond the last eight at Wimbledon.
Juan Martin del Potro, who has been plagued by wrist problems, is a former world number four playing his first Grand Slam since the 2014 Australian Open.
Wawrinka to serve first and you can watch the action with a simple click at the top of this page.
Teenager's injury drama
There were emotional scenes on Court Two last night as Croatian teenager Ana Konjuh suffered an ankle injury deep into the deciding set of a gripping duel against third seed Agnieszka Radwanska.
Locked at 7-7, the 18-year-old had her ankle strapped and limped on but the 2012 finalist took the next two games to triumph.
Ana Konjuh suffers injury after tripping on ball
There have been some celebrity arrivals at Wimbledon, hardy types who have not been put off by the rain.
Former England footballer Graeme Le Saux and his wife Mariana....
Image source, Getty ImagesInternational development secretary Justine Greening taking a day out from a quiet week in politics...
Image source, Rex Features...and England cricket captain Alastair Cook and his wife Alice.
Image source, Rex Features#bbctennis
...the roof, that is.
Centre Court is now sheltered from the rain so play will get under way as planned at 13:00 BST.
As it stands, the outside courts are still suspended but the officials are aiming to get those matches started at the same time as Centre, so two hours later than planned.
We'll keep you posted.
Image source, BBC Sport
Image source, BBC SportWhat do you do when there's no play at a shower-scattered Wimbledon? Indulge in an early spot of lunch seems to be the favoured choice.
Hundreds have piled into the Pergola Bar just next to Centre Court, with tipples varying from a bit of fizz to a warm brew.
And if your belly is rumbling take your pick out of this little lot...
Image source, BBC Sport
Image source, Getty ImagesDominika Cibulkova - the world number 18 and Eastbourne champion - was asked this week if she missed having Maria Sharapova on tour.
"She's a totally unlikeable person. I don't miss her on the tour. Arrogant, conceited and cold. When I sit beside her in the locker room, she won't even say hello," said the Slovak., external
We'll put you down as a 'no' then.