Mercedes driver George Russell headed Red Bull’s Max Verstappen in first practice at the Azerbaijan Grand Prix.
Championship leader Kimi Antonelli was fifth fastest, but did not get a lap on the fastest soft-compound tyres after stopping on track with a hydraulic leak.
Russell, who trails Antonelli by 81 points, was 0.4 seconds quicker than Verstappen.
Ferrari’s Charles Leclerc and Lewis Hamilton were third and fourth, both just over 0.4secs off Russell’s pace and right behind Verstappen.
But neither Italian car ran the soft tyre as the teams completed varied programmes to start off the weekend in Baku.
Antonelli, who ended up 0.878secs off Russell’s fastest time, was the fastest driver in the early running using the hard tyres.
The Italian stopped at Turn One on his first lap on the soft tyres, with smoke seeping out of the cooling vents on his engine cover.
He missed half the session so will have some catching up to do in the second session later in the day.