Red Bull's Max Verstappen was the surprise pace-setter ahead of the two Mercedes in second practice at the German Grand Prix.
The Dutchman, whose team are not expecting to be able to compete for pole with Mercedes and Ferrari, pipped Lewis Hamilton by 0.026 seconds.
Hamilton, who made a mistake on his best lap, was 0.225secs clear of title rival Sebastian Vettel.
Hamilton's team-mate Valtteri Bottas was also ahead of the German's Ferrari.
Verstappen's fastest time meant Red Bull topped both sessions on Friday, after team-mate Daniel Ricciardo set the pace in the morning session from Hamilton by just 0.004secs.
EPACopyright: EPA
'We can still improve'
Max Verstappen, fastest in session two, tells Sky Sports: "We found we had a little oil leak but we had to go out again and it was all fine. We can still improve, I hope tomorrow we can be close."
Getty ImagesCopyright: Getty Images
'I'm quite excited'
Daniel Ricciardo, fastest in session one, but set to start at the back on Sunday, tells Sky Sports: "When you know in advance (about the penalty) I could prepare myself and I'm quite excited to come through and overtake, the pace seems decent."
And here are all the times from the second practice session. McLaren, Williams and Toro Rosso will be wondering if they can even make it out of Q1 tomorrow.
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The top 10
Verstappen 1:13.085
Hamilton 1:13.111
Bottas 1:13.190
Vettel 1:13.310
Raikkonen 1:13.427
Grosjean 1:13.973
Magnussen 1:14.189
Leclerc 1:14.374
Hulkenberg 1:14.496
Ocon 1:14.508
'Such a slender advantage'
Jolyon Palmer
Former Renault driver on BBC Radio 5 live
Red Bull have topped the times but it is such a slender advantage, for me Mercedes and Lewis Hamilton will be very happy and are in a good position for tomorrow.
BreakingVerstappen fastest in second practice
Red Bull was fastest earlier on with Daniel Ricciardo, now it is his team-mate Max Verstappen who is the quickest man out there.
However, Red Bull's day has been tempered by the fact they have grid penalties for Ricciardo meaning he will start at the back.
Still, good pace from them today.
Getty ImagesCopyright: Getty Images
Team-by-team
Red Bull - first and 13th (Verstappen and Ricciardo)
Mercedes - second and third (Hamilton and Bottas)
Ferrari - fourth and fifth (Vettel and Raikkonen)
Haas - sixth and seventh (Grosjean and Magnussen)
Sauber - eighth and 14th (Leclerc and Ericsson)
Renault - ninth and 12th (Hulkenberg and Sainz)
Force India - 10th and 11th (Ocon and Perez)
Toro Rosso - 15th and 16th (Gasly and Hartley)
McLaren - 17th and 20th (Alonso and Vandoorne)
Williams - 18th and 19th (Stroll and Sirotkin).
A good session for Haas and Sauber. A bad session for Toro Rosso, McLaren and Williams.
Get Involved #bbcf1
Driver penalties. Fair or not?
Chris Marsh aka Rek Arathor: Danny Ric can climb back to sixth from last easily enough. The only loss to Red Bull is an opportunity loss. Best way to stop over using parts would be points deductions. That would also reward midfield teams for reliability over those who can just fund their way to success.
Jamie Brown: You know the concept of grid penalties for non-driver errors is absurd, grid penalties should only be handed out if there's an error from the driver, not the engine. Also if a team have to change engine parts it should be a fine for the engine builder.
Post update
Will the race be won and lost in strategy and in the pits? Mercedes get some practice in anyway.
Fourth today in this second session for Sebastian Vettel, who holds an eight-point lead at the top drivers' championship.
Hamilton in the hotseat
"My seat is really hot," says Lewis Hamilton, who looks like missing out on being the fastest man by only 0.026 seconds.
ReutersCopyright: Reuters
Get Involved #bbcf1
Driver penalties. Fair or not?
Amit Mandalia: Only way to end penalties would be to freeze engine development which will only come when all four are roughly equal on performance. No idea what alternative to grid penalties would be though.
Peter: Re: penalties .. it's NOT the drivers fault... penalise the team by fining them some dosh or somesuch .. pushing the driver back is silly!
Sirotkin skids
Sergey Sirtotkin's struggles continue as he skids off the track, through the gravel and straight back into the pits he retreats.
Nineteenth today, he has not finished higher than 13th in any race this season and never threatened to get a point. A tough schooling in his debut campaign.
Ian: Team McLaren: I've said for a long time now, if it's a driver fault then a grid penalty, if it's the team then deduct constructor points.
Casey Jennett: I think grid penalties for engines should be dropped, and that if allocated number of components allowed is exceeded, then fine the engine supplier a fixed amount per component. Punishing the driver for component failures is like punishing a footballer for a pitch invasion.
WappingResident: Instead of grid penalties, why not constructor point deductions for Team/Car Issues and driver points for driving infringements.?
'Hearing a lot of noise'
"What's going on with the engine, when I'm downshifting I'm hearing a lot of noise," says Max Verstappen. He is fastest in the times, but it could be a frustrating end to the session for the Dutchman.
Live Reporting
By Michael Emons
All times stated are UK
Get involved
Thanks and goodbye
And that is all for today, but we will be back at 10:30 BST for all the action from third practice and qualifying.
Hope you can join us then.
Thanks as always for all your comments and see you again tomorrow. Bye for now.
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Verstappen fastest in second practice - read the report
Andrew Benson
BBC Sport’s chief F1 writer
Red Bull's Max Verstappen was the surprise pace-setter ahead of the two Mercedes in second practice at the German Grand Prix.
The Dutchman, whose team are not expecting to be able to compete for pole with Mercedes and Ferrari, pipped Lewis Hamilton by 0.026 seconds.
Hamilton, who made a mistake on his best lap, was 0.225secs clear of title rival Sebastian Vettel.
Hamilton's team-mate Valtteri Bottas was also ahead of the German's Ferrari.
Verstappen's fastest time meant Red Bull topped both sessions on Friday, after team-mate Daniel Ricciardo set the pace in the morning session from Hamilton by just 0.004secs.
'We can still improve'
Max Verstappen, fastest in session two, tells Sky Sports: "We found we had a little oil leak but we had to go out again and it was all fine. We can still improve, I hope tomorrow we can be close."
'I'm quite excited'
Daniel Ricciardo, fastest in session one, but set to start at the back on Sunday, tells Sky Sports: "When you know in advance (about the penalty) I could prepare myself and I'm quite excited to come through and overtake, the pace seems decent."
Post update
Three sectors, three teams represented.
The times that matter
And here are all the times from the second practice session. McLaren, Williams and Toro Rosso will be wondering if they can even make it out of Q1 tomorrow.
The top 10
'Such a slender advantage'
Jolyon Palmer
Former Renault driver on BBC Radio 5 live
Red Bull have topped the times but it is such a slender advantage, for me Mercedes and Lewis Hamilton will be very happy and are in a good position for tomorrow.
BreakingVerstappen fastest in second practice
Red Bull was fastest earlier on with Daniel Ricciardo, now it is his team-mate Max Verstappen who is the quickest man out there.
However, Red Bull's day has been tempered by the fact they have grid penalties for Ricciardo meaning he will start at the back.
Still, good pace from them today.
Team-by-team
Red Bull - first and 13th (Verstappen and Ricciardo)
Mercedes - second and third (Hamilton and Bottas)
Ferrari - fourth and fifth (Vettel and Raikkonen)
Haas - sixth and seventh (Grosjean and Magnussen)
Sauber - eighth and 14th (Leclerc and Ericsson)
Renault - ninth and 12th (Hulkenberg and Sainz)
Force India - 10th and 11th (Ocon and Perez)
Toro Rosso - 15th and 16th (Gasly and Hartley)
McLaren - 17th and 20th (Alonso and Vandoorne)
Williams - 18th and 19th (Stroll and Sirotkin).
A good session for Haas and Sauber. A bad session for Toro Rosso, McLaren and Williams.
Get Involved #bbcf1
Driver penalties. Fair or not?
Chris Marsh aka Rek Arathor: Danny Ric can climb back to sixth from last easily enough. The only loss to Red Bull is an opportunity loss. Best way to stop over using parts would be points deductions. That would also reward midfield teams for reliability over those who can just fund their way to success.
Jamie Brown: You know the concept of grid penalties for non-driver errors is absurd, grid penalties should only be handed out if there's an error from the driver, not the engine. Also if a team have to change engine parts it should be a fine for the engine builder.
Post update
Will the race be won and lost in strategy and in the pits? Mercedes get some practice in anyway.
Post update
Fourth today in this second session for Sebastian Vettel, who holds an eight-point lead at the top drivers' championship.
Hamilton in the hotseat
"My seat is really hot," says Lewis Hamilton, who looks like missing out on being the fastest man by only 0.026 seconds.
Get Involved #bbcf1
Driver penalties. Fair or not?
Amit Mandalia: Only way to end penalties would be to freeze engine development which will only come when all four are roughly equal on performance. No idea what alternative to grid penalties would be though.
Peter: Re: penalties .. it's NOT the drivers fault... penalise the team by fining them some dosh or somesuch .. pushing the driver back is silly!
Sirotkin skids
Sergey Sirtotkin's struggles continue as he skids off the track, through the gravel and straight back into the pits he retreats.
Nineteenth today, he has not finished higher than 13th in any race this season and never threatened to get a point. A tough schooling in his debut campaign.
Just sitting around
Get Involved #bbcf1
Driver penalties. Fair or not?
Ian: Team McLaren: I've said for a long time now, if it's a driver fault then a grid penalty, if it's the team then deduct constructor points.
Casey Jennett: I think grid penalties for engines should be dropped, and that if allocated number of components allowed is exceeded, then fine the engine supplier a fixed amount per component. Punishing the driver for component failures is like punishing a footballer for a pitch invasion.
WappingResident: Instead of grid penalties, why not constructor point deductions for Team/Car Issues and driver points for driving infringements.?
'Hearing a lot of noise'
"What's going on with the engine, when I'm downshifting I'm hearing a lot of noise," says Max Verstappen. He is fastest in the times, but it could be a frustrating end to the session for the Dutchman.