Ferrari's Charles Leclerc was cautious about his chances of winning two Formula 1 races in succession for the first time in his career despite going fastest in the second practice of the Azerbaijan Grand Prix.
Leclerc recovered from a crash in the morning to set the pace in the afternoon, 0.006 seconds ahead of Red Bull's Sergio Perez and 0.066 seconds in front of Lewis Hamilton of Mercedes.
Championship leader Max Verstappen finished fifth, while his challenger Lando Norris struggled and languished in 17th after the second classification in Baku.
Despite going quickest, Leclerc admitted there were issues with his Ferrari car, leaving work to do if he wants to get pole position in Azerbaijan for a fourth successive year.
He said: "The thing is that when we started FP2 there was an actual problem on the car that we saw later on, once I stopped, and we changed that particular part.
"It's one of the tracks that I quite like, and we've been pretty quick in the past, but that doesn't mean it will be the case for tomorrow.
"I mean, the crash, there's not much to go into. I braked a little bit too much on the right, the track was still dirty, I locked up, and it was too late to go to the right [run-off] – so I went into the wall."
Norris endured a far more difficult afternoon, only mustering 17th after coming across Alpine's Pierre Gasly in the final sector when attempting his fastest lap.
The Brit cannot afford many slip-ups from now until the end of the season, as he looks to overhaul Verstappen's 62-point lead with eight races remaining, but was downbeat about McLaren's chances this weekend, believing they were lagging behind their competitive rivals.
"We're quite a long way off," Norris said.
"I’m having to push way too much to try and get a lap time out of it.
"Mercedes, Ferrari and Red Bull, they're all very similar. And then there's a good 0.3 to 0.4 second gap back to us, so a lot of work to do.
"Ferrari are very quick here. Mercedes will be quick with these track conditions. It's very slidey out there."