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Lewis Hamilton said Monaco this year is the "bumpiest" track he has ever driven because of problems with his Mercedes car in Friday practice.
Hamilton was only 12th fastest after a difficult day, complaining he did not manage to get a lap together. Team-mate George Russell was sixth.
"There are, like, 100 bumps on just one straight," Hamilton said.
"I don't know whether the others are experiencing the same as us. But it's the bumpiest roller-coaster ride."
Ferrari's Charles Leclerc set the pace in both sessions, leading team-mate Carlos Sainz by the end of the day, both drivers more than 0.3 seconds quicker than Sergio Perez and Max Verstappen of title rivals Red Bull.
Russell was 0.7secs off the pace, and Hamilton a further 0.9secs back.
Hamilton complained about "bouncing" - but said it was not the same as the high-frequency aerodynamic problem that had afflicted Mercedes until their upgrade in Spain last weekend.
"It's the bumpiest the track's ever been. It's probably the bumpiest track I've ever driven," the seven-time champion said.
"That makes it difficult but in general our car bounces a lot. It's different bouncing to what we've experienced in the past because it's in the low speed [corners] also, but it's not aero. The bumps are making it worse.
"Putting a lap together is, wow, whole new ground. I don't remember experiencing that before.
"The grip doesn't feel terrible but it's just eyeballs coming out of the sockets. As anticipated, I didn't think we would be as quick as the Ferraris and Red Bulls. Our battle is to try and stay ahead of the McLarens."
Russell added: "The car is constantly smashing against the floor. We have experienced a lot of that this year but this is a very different philosophy and reasoning for the bouncing.
"There are sections where both tyres are off the ground - in Turn Five, the front right in the air, and it's so stiff the front left is popping up as well. You're almost doing a wheelie. We're doing everything we can to make it easier for us.
"It was a relatively good day but we are not where we want to be.
"We want to be best of the rest. That is a fair result this weekend behind Ferrari and Red Bull but we want to make sure we don't have cheeky little Lando popping it in there too."