Lewis Hamilton dominated first practice at the Chinese Grand Prix as he seeks to bounce back from losing the first two races of the season.
Despite a spin in Turn 10, it was the best possible start to the weekend for Hamilton, who was in scintillating form on a track where he has often excelled.
The world champion ended the session 0.359 seconds quicker than Kimi Raikkonen, despite using harder tyres.
Hamilton's team-mate Valtteri Bottas was third, 0.458secs off the Briton.
Hamilton was the quickest man every time he hit the track, from his first flying lap, which was more than a second quicker than anyone else at the time.
He was on course for an even faster lap midway through the session, after Bottas closed the gap to under half a second for the first time, but lost control negotiating the complex before the long main straight.
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Neither Mercedes driver used the fastest ultra-soft tyre, which all other leading drivers used to set their fastest time, preferring to stick with the slower 'soft'.
The Red Bulls of Daniel Ricciardo and Max Verstappen were fourth and fifth quickest, the Dutchman setting his time just 0.131secs off the Australian despite tyres damaged in a spin and trip through the gravel trap at the last corner.
Haas were best of the rest, with Kevin Magnussen seventh and Romain Grosjean ninth split by Renault's Carlos Sainz, whose team-mate Nico Hulkenberg was 10th.
And Toro Rosso were again ahead of McLaren, Pierre Gasly, so impressive on his way to fourth in Bahrain last weekend, 11th fastest, 0.007secs quicker than McLaren's Fernando Alonso.
Their team-mates had a difficult session. Brendon Hartley in the second Toro Rosso was 0.678secs off Gasly and Stoffel Vandoorne had a spin and visit to the gravel on his way to 18th fastest, 0.712secs off Alonso.