Williams beats Putintseva 5-7 6-4 6-1
Bertens beats Bacsisnzky 7-5 6-2
Djokovic beats Berdych 6-3 7-5 6-3
Thiem beats Goffin 4-6 7-6 6-4 6-1
*Williams 5-7 4-4 Putintseva
Yulia Putintseva is channeling the spirits that Stan Wawrinka called up for last year's final on the same court.
A whopper of a backhand down the line brings up 30-30.
Serena duffs long on the next point and the Kazakh has a break point.
Serena comes thundering into the net, applies the pressure and sees it off to make deuce.
Alix Ramsay
Journalist, The Scotsman, on BBC Radio 5 live sports extra
"Serena looks like she can hardly believe it but almost looks resigned to it. She's looking a miserable."
Image source, EPA*Williams 5-7 4-4 Putintseva
The Great Escape.
Yulia Putintseva dives out of the way of an over-cooked Serena forehand to allow it to fly long.
She has recovered from 0-40 down to win five straight points,
Williams 5-7 4-3 *Putintseva
Yulia Putintseva takes a punt down the line as Serena Williams offers her corridor of space at 0-15 up.
Just long.
Love-thirty becomes 0-40 and three break points as Williams hammers away an exocet winner.
Two back in the bag as Serena fails to get over the top of a high baseline bounce.
Putintseva smuggles in a second serve on the next point and hits a gutsy top-spinning forehand winner to get to deuce.
Big news in the Murray household where border terrier Maggie has a book out today - How to look after your Human.
Like all the biggest stars, she has employed a ghost writer to do all the donkey work of actually turning thoughts into words. Andy's wife Kim Sears has got the gig.
Dogs always make live text commentaries better. Fact.
Williams 5-7 4-3 *Putintseva
Yulia Putintseva with a break point.
Serena Williams misses with her first serve. And second!
Audible gasps around Philippe Chatrier.
This set is back on serve and the shock is back on.
*Williams 5-7 4-2 Putintseva
Yulia Putintseva rips an absolute brute of a forehand across court for 30-30.
A blur of a shot. Such power for such a small frame.
She is wide as she attempts to go up the line in the next point. But Serena has pumped a forehand long.
We are to deuce and a chance for Putintseva to buy a pass back into the second set.
Image source, EPA*Williams 5-7 4-2 Putintseva
Serena Williams crunches a backhand almost sideways into the umpires' chair for a winner and 15-30.
Here is a little pressure for the Kazakh to deal with.
Putintseva fights her way back to 40-30 with an ace and a net press.
And finishes the job with a clean-as-a-whistle forehand against the grain.
She is sticking around in this set even with Williams on the rampage.
Dan King
Sun journalist on BBC Radio 5 live sports extra
"Putintseva not only needs to hold her serve but puts up a fight on Serena's
"If Serena gets momentum you would fear for her chances. She needs to give Serena something to think about."
Williams 5-7 4-1 *Putintseva
Serena Williams has not lost any of the many layers that she has wrapped herself up in today.
She is sporting a long-sleeved top and mid-length leggings, along with her tennis skirt.
And her game looks like it is warming up in there.
She drags Putintseva around the court surface like an old mop as she stretches the second-set scoreline further her way.
*Williams 5-7 3-1 Putintseva
Serena Williams has done the calculations and come up with a new tactic, pushing Yulia Putintseva back onto the line judges's toes at the back of the court before teasing a drop-shot into the front.
Three break points at 0-40 are the reward for her invention.
Yulia Putintseva whacks away a winner to get within sight of safety at 30-40, but over-cooks as she presses too hard on the next point.
Serena with her nose in front.
Image source, EPAWilliams 5-7 2-1 *Putintseva
After the semi-strop, Serena Williams is showing her streetsmarts.
The top seed reads Yulia Putintseva's intentions brilliantly to pat away a forehand volley in the first point of the game.
A well-weighted little bunt over the top of the Kazakh wins the final point.
She holds to 30 to turn the screw a little tighter.
*Williams 5-7 1-1 Putintseva
Serena Williams clambers into a smash, hammering into the red dirt to break back.
Is this the start of the comeback?
Image source, PAWilliams 5-7 0-1 *Putintseva
Serena Williams' body language is that of Harry Enfield's Kevin the Teenager.
By contrast, Yulia Putintseva is jigging about like a Californian life coach.
Williams is thumping the ball hard, Putintseva is haring around like a terrier.
We are to deuce.
Dan King
Sun journalist on BBC Radio 5 live sports extra
"This could be the biggest story of the tournament so far."
Image source, Getty ImagesWilliams 5-7 0-1 *Putintseva
Not only have the wheels have come off, but the engine has dropped out and the gearbox is mush.
Serena Williams looks like she would rather be anywhere than on court. Yulia Putintseva has her teeth deep in and breaks to love.
Sound the klaxon, clear the area, the biggest seed of all could be falling.
#bbctennis
Slang: Can't help but like Yulia Putintseva. Like a box of fireworks, usually all going off at once.
Ben Ainsworth: People think serena's game is off - but Putintseva's beating her with great tactics. Loopy forehands are working a treat.
*Williams 5-7 Putintseva
Yulia Putintseva celebrated that first set lustily, flinging her arms skywards and exhorting more volume from the cheap seats.
She has got the eye of the tiger.
If Serena spotted those antics though, it might be the sort of thing that relights her fire.
Serena to serve first in the second set.
Dan King
Sun journalist on BBC Radio 5 live sports extra
"Putintseva's urging the crowd to get behind her and they really are.
"It was superb. She's stood up to Serena and did everything you could possibly ask."
*Williams 5-7 Putintseva
This is the tennis equivalent of a wet Wednesday night in Stoke.
The wind is whistling around Court Philippe Chatrier and Serena Williams is failing the test.
The American allows the set to slip away as Putintseva holds to love.
Image source, Getty Images