Fernando Alonso's Ferrari topped the times after Thursday's morning session on the second day of pre-season testing at Bahrain's Sakhir circuit.
The Spaniard led the way with a best time of 1min 37.00sec, followed by Valtteri Bottas in a Williams and Force India's Nico Hulkenberg, who took the honours on Wednesday, in third.
Red Bull's testing traumas finally relented with Sebastien Vettel completing 26 laps, five laps more than the world champions managed over the entire four days at Jerez last month.
1. Fernando Alonso (ESP/Ferrari) 1min 37.700sec (31 laps), 2. Valtteri Bottas (FIN/Williams) 1:37.882 (43 laps), 3. Nico Hulkenberg (GER/Force India) 1:38.394 (24 laps), 4. Kevin Magnussen (DEN/McLaren) 1:39.958 (8 laps), 5. Sebastian Vettel (GER/Red Bull) 1:40.540 (26 laps), 6. Jean-Eric Vergne (FRA/Toro Rosso) 1:40.609 (53 laps), 7. Nico Rosberg (GER/Mercedes) 1:40.932 (34 laps), 8. Esteban GutiÃ©rrez (MEX/Sauber) 1:41.135 (40 laps), 9. Romain Grosjean (FRA/Lotus) 1:41.670 (15 laps), 10. Max Chilton (GBR/Marussia) 1:42.511 (14 laps), 11. Kamui Kobayashi (JPN/Caterham) 1:45.059 (8 laps)