Ferrari's Sebastian Vettel has topped the time sheet on both of the opening two days of F1 testing in Barcelona.

After a disappointing 2015, Ferrari look set to enjoy a highly improved season, with Vettel's fastest lap of 1:22.810, 0.7 seconds quicker than second placed Daniel Riccardio.

Sergio Perez rounded out the top three with 1:23.650.

Day two testing:

1. Sebastian Vettel, Ferrari, ultrasoft tyres, 1:22.810, 126 laps;

2. Daniel Ricciardo, Red Bull, ultrasoft tyres, 1:23.525, 112 laps;

3. Sergio Perez, Force India, supersoft tyres, 1:23.650, 101 laps;

4. Nico Rosberg, Mercedes, medium tyres, 1:24.867, 172 laps;

5. Marcus Ericsson, Sauber, soft tyres, 1:25.237, 108 laps;

6. Esteban Gutierrez, Haas, soft tyres, 1:25.524, 79 laps;

7. Valtteri Bottas, Williams, soft tyres, 1:25.648, 134 laps;

8. Pascal Wehrlein, Manor, soft tyres, 1:25.925, 71 laps;

9. Fernando Alonso, McLaren, soft tyres, 1:26.082, 119 laps;

10. Jolyon Palmer, Renault, soft tyres, 1:26.189, 42 laps;

11. Max Verstappen, Toro Rosso, soft tyres, 1:26.755, 121 laps.