The Silver Arrows have work to do in Monaco after a tough opening day of on-track action around the streets of Monte Carlo.
Lewis: We didn't have the greatest day today
Lewis topped a busy opening session on Thursday, racking up 40 laps and clocking a 1:13.425s to go fastest of all, 0.196s clear of Sebastian Vettel's Ferrari in P2.
But Lewis could not replicate his pace from the morning into the second session, ending the day in eighth, over a second adrift of Vettel's pacesetting Ferrari.
"We didn't have the greatest day today," said Lewis. "Practice one was actually really good and we were quickest, but then in second practice we just struggled to extract the grip from the tyres and we were sliding around a lot.
Lewis: Monaco is always amazing to drive
"I'm not sure why the tyres weren't working but the difference between the two sessions was night and day. We've got some work to do ahead of Saturday that's for sure but I'm confident the team can work it out.
"Monaco is always amazing to drive, but this is definitely the best car I've driven around here. Ferrari are very quick again and Red Bull are also looking good this weekend. We're looking forward to a real fight on Saturday."
Valtteri: It will be close again at the top I'm sure
Valtteri traded fastest times with Lewis in the morning, ending the session in P3, just behind Vettel. But like Lewis, the Finn had a tougher afternoon, managing just 10th on the leaderboard.
"Practice two was difficult and we struggled with the pace over one lap," said the Finn. "We made some changes between practice one and practice two but we clearly went in the wrong direction - that's why both of us were struggling.
"When the car isn't quite right you lose a lot of time in Monaco. We tried to go back with the set-up and it felt better but by that point we'd already put a lot of laps into the tyres. At least we've learned what not to do with the set-up here.
"It's a shame but we have a full day tomorrow to analyse everything and come back stronger on Saturday. It will be close again at the top I'm sure.
James: We will have a good think about it tomorrow
Mercedes-AMG Petronas Motorsport Technical Director James Allison expects the team to bounce back on Saturday in time for qualifying.
"After a very positive morning session with both cars and drivers, the afternoon proved more difficult and we clearly took a step in the wrong direction with the car set-up over the break," said James.
"We will have a good think about it tomorrow in order to put things right for Saturday. But I think we can be encouraged by the pace and consistency that we were able to demonstrate in FP1."
The Silver Arrows will be back on track on Saturday... We'll be making the most of Friday, hitting up the best spots that from Valtteri and Lewis' driver tour guide! They are Monaco locals after all.