Impact is umpire's call. We stay with Bruce Oxenford's on-field call. The most nerve-wracking 30 seconds of Jennings' burgeoning Test life end in survival.

Ed Smith
Ex-England batsman on BBC Test Match Special

I thought very clearly it was pad first.

Every Indian player is up for this. Jennings is caught on the pad offering a tentative forward defensive shot. Not out on the field. Upstairs we go.

Jonathan Agnew
BBC Test Match Special

There's a healthy number of England fans scattered round the stadium. There might not be that many here, but they're certainly loud. They're in the top tier of the Sachin Tendulkar Stand.

They are still queuing to get in. All the while, they are missing a fascinating early battle between bat and ball. If Jennings was under any illusion as to what the step up to Test cricket entailed, he is quickly finding out.

Michael Vaughan
Ex-England captain on BBC Test Match Special

Sometimes here in Mumbai you can get the ball to swing and carry nicely through to the keeper. There's just an extra bit of bounce, which is what you want as a batsman.

That early drop off Jennings has encouraged India to explore what the young opener has in response to the short ball. Kumar digs his first few balls in to the turf. A subsequent fuller ball then catches a leading edge but, thankfully for Jennings, not enough to send it spinning into air. 

Ben Garrett: If Jennings does well, would it make sense to have a top 3 of Cook, Hameed and him (unsure of order) with Root at 4?

This may settle Jennings down. He is off the mark with a cut for four - a score he doubles with a pull for another boundary. It has been worth the early rise so far. Lively stuff.

Image source, Reuters

Jonathan Agnew
BBC Test Match Special

It was a short, hostile ball but that should have been caught. What a life for Jennings.

Jennings dropped on 0published at 3.3 overs

3.3 overs

Eng 10-0

Jennings is flirting with disaster. He drives and misses one ball before fending off a short ball to Nair at gully. The fielder dives but can't hold on with one hand. A life.

Michael Vaughan
Ex-England captain on BBC Test Match Special

England have got to make this count because this is a really good pitch. There's no swing and Virat Kohli has realised straight away that this is a beauty. It won't be long before we see Ashwin, with two left handers.

Umpire Bruce Oxenford, you big tease. Jennings thinks he is off the mark until a late call for a leg bye sends him back to zero. Cook looks to be settling in nicely until a misjudged attempted steer to leg takes a leading edge and rockets wide of the slips for four. Lucky, lucky, lucky. He'd have been furious with himself had that sent him back to the dressing room. This looks a belter of a track.

Michael Vaughan
Ex-England captain on BBC Test Match Special

If you're a selector, you have to pick who you think is the best player. Jennings has qualified and he has got every right to play for England. He's available, he's played county cricket for a while and he's had a tremendous season for Durham. The selectors clearly feel he is a good way ahead of Nick Gubbins.

As Umesh Yadav charges in to give Keaton Jennings his first ball in Test cricket, England's new opener mouths the words 'watch the ball'. He does just that, leaving outside off. He has to cope with a bit of movement and also a short ball that gets only as high as his hip.

Michael Vaughan
Ex-England captain on BBC Test Match Special

Short leg has been taken out after two balls.

Keaton Jennings decides to view the first few balls of his Test career from the non-striker's end, leaving his skipper, Alastair Cook, to tackle the initial efforts of Bhuvneshwar Kumar. He does that well, flicking the first runs - a couple - off his legs. No swing to report in that set of six.

England: Alastair Cook (capt), Keaton Jennings, Joe Root, Moeen Ali, Ben Stokes, Jonny Bairstow (wk), JC Buttler, Chris Woakes, Adil Rashid, James Anderson, Jake Ball.

India: Murali Vijay, KL Rahul, Cheteshwar Pujara, Virat Kohli (capt), Karun Nair, Ravichandran Ashwin, Parthiv Patel (wk), Ravindra Jadeja, Jayant Yadav, Bhuvneshwar Kumar, Umesh Yadav.

Umpires: Bruce Oxenford (Australia), Paul Reiffel (Australia).

TV umpire: Marais Erasmus (South Africa); Match referee: Jeff Crowe (New Zealand).

Jonathan Agnew
BBC Test Match Special

This is England's sixth Test match in a row of this long winter - and it's starting to show if you look at the team.