Shanghai - 2018 Formula 1 championship leader Sebastian Vettel ended off practice with the fastest time for Sunday's Chinese Grand Prix.
Mercedes' Lewis Hamilton was quickest in the opening two practice sessions.
Vettel topped the timesheets ahead of Kimi Raikkonen, Valterri Bottas, Max Verstappen, Hamilton and Kevin Magnussen.
While Red Bull are in a race against time to change Daniel Ricciardo's engine and what tyres will be used in Qualifying 2.