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Root scores century in his 100th Test, off 164 balls
England captain's third ton in three Tests
Opener Sibley also nearing century
First Test, day one, Chennai, England won toss
Sibley 35, Root 18
Dom Sibley is playing the left-arm spinner better than he did in Sri Lanka. He got out to Lasith Embuldeniya three times in four innings but here has played Nadeem well.
One run comes from the first over after drinks.
Jonathan Agnew
BBC cricket correspondent on The Cricket Social
It is fascinating cricket, it really is.
England have to be happy with that hour since lunch. They may have only added 25 runs but they have not lost a wicket.
They had to recover after that crazy spell before lunch when England lost two wickets in 15 minutes before the break, having earlier looked comfortable.
Michael Vaughan
Former England captain on the Cricket Social
India are such a better team than Sri Lanka - their bowling has been so much more disciplined.
Jasprit Bumrah is a wizard. I love the way he tip toes in and then whish it's down the other end at 85-86mph with a little bit of reverse swing.
Dave (hamstring), Steve (thigh), Dean (tuna) are all out. Excellent stuff although painful, I'm sure.
#bbccricket
Dean Cornish: I genuinely got injured (was out for 2 months) after treading on a serrated tuna can whilst preparing teas for a game. It needed 7 stitches!
Root greets off-spinner Washington Sundar by playing the shot of the day so far. He finds a gap at extra cover perfectly.
The England skipper then gets down to sweep, I think for the first time today. We saw that so much in Sri Lanka.
Five from the over and that's drinks.
Michael Vaughan
Former England captain on the Cricket Social
Recent history of India in pink ball cricket, they were bowled out for 36 at the Adelaide Oval, so I do look at this tour and think that could be England's real opportunity.
Batting first here is an opportunity but they are going to have to bat really well. The game is on a knife edge at the moment because England haven't really gone anywhere. It's a nice start, it's ok, but I don't think India will feel too threatened because the scoring rate isn't moving.
Image source, BCCIIt's a double change from Virat. Washington Sundar replaces his fellow spinner Ashwin.
This may be a little chance for England to get going after a spell of intense pressure from India. They won't want to throw their wickets away to the back-up bowlers, mind.
Nadeem was a little wayward in his five-over spell earlier. He's better here although Root gets back to chop a single.
Michael Vaughan
Former England captain on the Cricket Social
There was lots of debate around the team - Ben Foakes could have played, Dan Lawrence got moved to three rather than Ollie Pope because Pope is just back into the team.
If you look at Lawrence he played nicely in his first Test, struggled more in the second, and now all of a sudden he's batting at three against the likes of Jasprit Bumrah. I think it was too big a step at this stage.
Ishant's impressive spell is over. It's spin from both ends with left-armer Nadeem Shahbaz back in the attack.
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Sibley 35, Root 11
It's not cricket but didn't Rio Ferdinand injure his knee watching TV? Impressive stuff.
Sibley gets a much-needed boundary to release some pressure. He gets forward and clips Ashwin through mid-wicket.
Ashwin gives Rohit a glare for not getting down to prevent the runs.
Henry Moeran
The Cricket Social
We want to hear about your favourite freak cricket injuries - or even better ones experienced in your side.
But I'm going to nominate my favourite ever when Quinton de Kock was walking his dog, the night before the Test, he tripped over his dog and injured himself. He twisted his ankle and was out of the Test. It's even more unfortunate when you don't alert the rest of the camp what has happened so the very next morning and they turn round and go 'where's Quinton' and they have to fly someone up from Port Elizabeth.
Rohit has now put a helmet on and moved even closer at slip. It'll take a good catch to hold onto the ball there.
Ishant is running in hard, sweat making a mess of his floppy fringe.
Root is tentative but still grins at the end of the over when Cheteshwar Pujara misses with a throw at the stumps.
Edged by Root! Short of Rohit Sharma under a floppy hat at slip.
India are right on it here.
Sibley 31, Root 11
The pressure is building on Sibley. I can sense it. Three times in Ashwin's latest over he picks out a well-placed fielder at mid-wicket.
The Indians are getting more and more animated around the bat.
Image source, BCCI#bbccricket
Conner Hoye: Sibley needs to start rotating the strike at the very least otherwise he's going to get bogged down and get out to a false shot - Root doesn't need the pressure either.
Kohli looked like he wanted to review there, knowing it was the big wicket of Root, but ultimately decided against it.
A good delivery.