Postpublished at 06:25 British Summer Time 6 October 2017
Williams driver Lance Stroll, speaking to BBC Radio 5 live: "It doesn't look very driveable. We will see how it continues."
Summary
Heavy rain hampers teams' running in second practice
Vettel fastest in first practice, two tenths quicker than Hamilton
Toro Rosso's Carlos Sainz crashes in FP1
Hamilton leads Vettel by 34 points in title race
Get involved #bbcf1
Postpublished at 06:25 British Summer Time 6 October 2017
Next inspection at 06:30 BSTpublished at 06:23 British Summer Time 6 October 2017
The safety car is back at base and will pop out for another look at the conditions at 06:30 BST.
Get involved #bbcf1published at 06:21 British Summer Time 6 October 2017
Jeremiah Kariuki: Parts of the track look like a swimming pool! Maybe it should be opened for swimming fun!
Postpublished at 06:20 British Summer Time 6 October 2017
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End of twitter postPostpublished at 06:19 British Summer Time 6 October 2017
The safety car has gone out to assess the conditions. Lots of spray kicking up behind it as it circulates the track.
Postpublished at 06:14 British Summer Time 6 October 2017
Important development.
Stoffel Vandoorne has successfully managed to sail his paper boat down the pit lane.
Postpublished at 06:12 British Summer Time 6 October 2017
The rain is flooding back up and out of the drains. Not a good sign.
We're 10 minutes into the session and the rain is falling just as heavy as it was before the start of practice.
Could be waiting a while.
Postpublished at 06:07 British Summer Time 6 October 2017
A new entry for wet weather practice bingo. Stoffel Vandoorne trying to sail a paper boat.
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End of twitter postGet involved #bbcf1published at 06:06 British Summer Time 6 October 2017
Wet weather bingo
Anyone fancy playing rain-delayed practice bingo?
What do you think we are likely to see happen while we wait for the weather to ease?
We've had so far:
A duck
Drenched fans in ponchos.
Fire over your suggestions to #bbcf1
The clock is tickingpublished at 06:04 British Summer Time 6 October 2017
Andrew Benson
BBC Sport’s chief F1 writerSo, people, this is not like when qualifying is delayed. Clock is ticking down. It will end 07:30 BST come what may.
Postpublished at 06:02 British Summer Time 6 October 2017
Full wets for this little fella, who is reveling in the conditions.
Image source, .FP2 "delayed indefinitely"published at 05:57 British Summer Time 6 October 2017
Hold your horses!
Race control says the start of second practice is delayed due to the rain.
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End of twitter postPostpublished at 05:56 British Summer Time 6 October 2017
Andrew Benson
BBC Sport’s chief F1 writerRenault announce former FIA technical chief Marcin Budkowski is to join them as executive director. Rivals not happy.
Postpublished at 05:56 British Summer Time 6 October 2017
Second practice gets under way in a touch under five minutes but before we crack on, a bit of news...
Postpublished at 05:51 British Summer Time 6 October 2017
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End of twitter postPostpublished at 05:50 British Summer Time 6 October 2017
Image source, .It stayed mostly dry for first practice. Mostly.
Different story for second practice.
It's raining.
A cause for concern for Hamilton?published at 05:47 British Summer Time 6 October 2017
Andrew Benson
BBC Sport’s chief F1 writer
Image source, Getty ImagesSebastian Vettel's pace in first practice was a worrying sign for Lewis Hamilton and Mercedes, who in theory were expected to be the quickest combination in Japan.
The track's long corners and sensitivity to engine power should mean it suits the Mercedes, whereas other tracks in the closing stages of the season are expected to favour Ferrari.
So if Vettel can be competitive or even beat Hamilton at Suzuka, it underlines why Hamilton was concerned about Mercedes' form even as he extended his lead with second place behind Verstappen in Malaysia last weekend.
A positive startpublished at 05:42 British Summer Time 6 October 2017
Image source, Getty ImagesA first-lap crash in Singapore, engine trouble in Malaysia; Sebastian Vettel really needs this weekend to go his way.
And so far it has.
Fastest in first practice, will he continue the momentum into the second session?
Postpublished at 03:43 British Summer Time 6 October 2017
Right. It's time for a quick power nap but we will be back at 05:45 BST for build up to second practice, which gets under way at 06:00.
First practice summary
- Sebastian Vettel finishes fastest, two tenths quicker than Lewis Hamilton
- Carlos Sainz crashed midway through the session
FP1 - full resultpublished at 03:37 British Summer Time 6 October 2017
Image source, .