Andy Murray beats Nikoloz Basilashvili 6-4 6-3 5-7 6-3
Murray served for match three times in third set, which he led 5-0
Match resumed with roof closed on Centre Court for fourth set
Heather Watson loses deciding set 8-6 to Kristie Ahn on Court One
Two-time champion Petra Kvitova loses 6-3 6-4 to Sloane Stephens
French Open finalist Stefanos Tsitsipas beaten in three sets by Frances Tiafoe
Novak Djokovic beats Jack Draper 4-6 6-1 6-2 6-2 on Centre Court
*Boulter 6-7 6-3 1-2 Lao
Katie Boulter has a heavily strapped right elbow but she's lasting the pace and going the distance here. Danielle Lao has ideas of her own, however, coming forward to shut off Boulter's path and slicing a volley beyond her. 30-30.
*Boulter 6-7 6-3 1-2 Lao
Danielle Lao comes at Katie Boulter with more slices than a freshly baked loaf and somehow holds after facing four break points. A chance missed for the Brit? We'll see...
Boulter 6-7 6-3 1-1 Lao*
The Briton will get another go after Danielle Lao goes wide. A fourth break point in this game, it's turning into a mammoth tussle.
Boulter 6-7 6-3 1-1 Lao*
Oh no!
Katie Boulter looked to have the point won, forcing Danielle Lao deep and then scuttling into the service box to meet a backhand, but she tugs it into the tape. Deuce once more.
Boulter 6-7 6-3 1-1 Lao*
Great depth and pace from the Brit and Danielle Lao miscues. A third chance to break for Katie Boulter... can she get over the line here?
Boulter 6-7 6-3 1-1 Lao*
And Danielle Lao saves that one too! Deuce.
Boulter 6-7 6-3 1-1 Lao*
And here comes Boulter... she's just crunched through the gears in this game to bring up two break points. A string of punchy forehands from the Brit, but Lao just keeps getting everything back and Boulter eventually goes into the net. One break point to go...
Boulter 6-7 6-3 1-1 Lao*
Good stuff from Katie Boulter as she moves to a quick hold too. The deciding set in this one remains on serve.
Stephens 6-3 6-4 Kvitova
Tracy Austin
Two-time Grand Slam champion on BBC TV
I didn't think Sloane Stephens would play this well because she hadn't played on grass - but she was flawless.
*Boulter 6-7 6-3 0-1 Lao
"Yes!" cries Danielle Lao after a well-made forehand that picks Katie Boulter off at the net. The American drives to 40-0 before Boulter gets on the board and then holds.
Boulter 6-7 6-3 0-0 Lao*
Lots of fans jostling for a sight of this one around the edge of court 17. Not many spaces left in the stands flanking the court. Danielle Lao will serve first in the deciding set.
Stephens 6-3 6-4 Kvitova
In the women's singles, 10th seed Petra Kvitova, a winner here in 2011 and 2014, is out, losing 6-3 6-4 to American Sloane Stephens.
Stephens is a Grand Slam winner herself, triumphing at the 2017 US Open, but is down at 73 in the world rankings.
There will now be a break of about half hour on Centre Court before the final match of the day - Andy Murray v Nikoloz Basilashvili.
"One of the most glorious moments in the life of Frances Tiafoe"
Katie Falkingham
BBC Sport at Wimbledon
I just came across a clamour of fans gathered near the media centre, all craning their necks looking up to the balcony on the top, where Novak Djokovic was doing interviews following his win over Jack Draper.
As he then departed, he waved to those gathered below, only to be stopped in his tracks by a security guard.
Looks like he didn't have his accreditation on show. It doesn't matter how big a name you are...
Image source, BBC SportBoulter 6-7 6-3 Lao
She only needs one! Another big serve from Katie Boulter that Danielle Lao can only pat wide and she takes the second set on court 17.
*Boulter 6-7 5-3 Lao
Right then, Katie Boulter's chance to serve for the second set and to level up this first-round match.
The Brit accelerates to 30-0 but is then undone by a superb sliced return from Danielle Lao.
Boulter comes up with a punchy first serve though and has two set points.
*Boulter 6-7 5-3 Lao
That's better from Danielle Lao, striding on to an overhead volley, but she can only send a forehand into the tape off the next. A zippy serve from the American gets her back on track and Lao holds.
Stephens 6-3 5-3 Kvitova*
Two-time Wimbledon champion Petra Kvitova is in loads of trouble in her first-round match with American Sloane Stephens on Centre Court.
Kvitova, the 10th seed, is 5-3 and a break down in the second set after losing the first 6-3.
Boulter 6-7 5-2 Lao*
So Danielle Lao, the American qualifier, finds herself serving to stay in the second set.
She also finds a Katie Boulter return come rifling back at her with interest. Boulter winds up for another big backhand but slides it wide. 15-15
Boulter 6-7 5-2 Lao*
Now can Katie Boulter back up that break? Danielle Lao throws a frustrated hand into the air after dicing wide but the American will challenge this... did it catch the chalk? Nope, that's the tramlines.
Boulter reaches low to drop a smart volley over the tape and takes a smart hold.