Sebastian Vettel set the pace during the final practice session for Bahrain Grand Prix on Saturday, leading a surprise Ferrari one-two.
Mercedes had set the early benchmark in FP3, with Lewis Hamilton and Nico Rosberg setting identical times - 1:33.150 - on soft tyres.
However, when teams put on the red-striped supersoft compound, the status quo broke with Vettel going quickest with a time of 1:31.683.
Raikkonen was marginally slower at 1:31.723, with Rosberg and Hamilton nearly four tenths adrift in third and fourth positions respectively.
Valtteri Bottas occupied the best-of-the-rest stop with fifth, despite not trialing the Williams nose cone.
Daniil Kvyat finished in sixth position ahead of Romain Grosjean, with the Frenchman’s strong result backed by an eighth place result for Haas teammate Esteban Gutierrez.
Further back, Felipe Massa was ninth in the second Williams, while Daniel Ricciardo completed the top 10.
Stoffel Vandoorne finished within four hundredths of a second of teammate Jenson Button, despite missing three quarters of the session due to an oil spillage. The McLaren duo were classified in 14th and 13th places respectively.
Force India chose not to run the supersoft compound in FP3 and ended up 2.5 seconds off the pace, with Nico Hulkenberg and Sergio Perez finishing 18th and 19th respectively.
by Rachit Thukral