Lewis Hamilton beat Mercedes teammate Nico Rosberg to the quickest time in the opening practice session for the F1 finale in Abu Dhabi.
In an uneventful 90 minutes of running, Hamilton posted a best time of 1:43.754 to outpace Rosberg by 0.141 seconds as the Mercedes duo dominated the session.
Kimi Raikkonen was third quickest in the Ferrari, but over seven tenths behind Hamilton.
Daniel Ricciardo finished in seventh place in the second Red Bull, ahead of Sergio Perez in the second Force India.
Pastor Maldonado (Lotus) and Williams driver Felipe Massa completed the top 10 runners.
The start of the session saw several teams attaching all kinds of sensors to their cars, with Ferrari going one step further and fitting what looked like laser sensors at the bottom of Raikkonen's SF15-T.
Rosberg was the first man to appear in the timesheets over 10 minutes after the start, as most drivers spent the early part of the session doing aero testing.
With the track very dirty, the times improved quickly and Rosberg established himself on top with a lap of 1:44.102 before Hamilton beat that over 23 minutes into the session with the first lap in the 1:43s.
But Rosberg improved once more - to a 1:43.895 - before the half-hour mark to regain P1 before the action stopped.
Hamilton returned to first place with 31 minutes left on the clock, setting a new best of 1:43.754 that would remain unbeaten.
Red Bull drivers Ricciardo and Kvyat, Vettel and Sauber's Felipe Nasr did not set a time in the first half the session, while Jolyon Palmer did not take to the track until the final minutes.
Scheduled to replace Romain Grosjean in the Lotus, Palmer could only run in the dying minutes as his car was not ready in time following yesterday's delays.
The Briton finished in 18th after a late spin, outpacing the Manors of Will Stevens and Roberto Merhi, returning to the cockpit to replace Alexander Rossi.
|4||Daniil Kvyat||Red Bull Racing||1:44.702||+0.948||23|
|6||Nico Hulkenberg||Force India||1:44.751||+0.997||22|
|7||Daniel Ricciardo||Red Bull Racing||1:44.893||+1.139||25|
|8||Sergio Perez||Force India||1:44.934||+1.180||27|
|9||Pastor Maldonado||Lotus F1 Team||1:45.314||+1.560||28|
|12||Max Verstappen||Toro Rosso||1:45.718||+1.964||32|
|16||Carlos Sainz Jr.||Toro Rosso||1:46.220||+2.466||21|
|18||Jolyon Palmer||Lotus F1 Team||1:46.501||+2.747||8|