Sebastian Vettel set the pace in first practice as Ferrari hinted they could be the team to beat at the Chinese Grand Prix this weekend.
Vettel finished the first session 0.207 seconds ahead of Mercedes' Lewis Hamilton - but the German was running harder tyres which should be slower.
Team-mate Charles Leclerc was third ahead of Red Bull's Max Verstappen.
Mercedes' Valtteri Bottas was fifth ahead of Renault's Daniel Ricciardo and Toro Rosso's Pierre Gasly.
As in Bahrain two weeks ago, Ferrari's advantage over Mercedes appeared mainly to be on the straights.