German world champion Sebastian Vettel set the fastest time on Wednesday for the second day of pre-season testing here.
The 23-year-old Red Bull driver clocked 1min 21.865sec around the Circuit de Catalunya to outpace Switzerland's Sebastien Buemi in a Toro Rosso.
It was the second successive day that defending constructors champions Red Bull had set the fastest time - Australian pilot Mark Webber setting the pace on Tuesday.
Sebastian Vettel (GER/Red Bull) 1:21.865
Sebastien Buemi (SUI/Toro Rosso) 1:22.396
Vitaly Petrov (RUS/Lotus Renault) 1:22.670
Lewis Hamilton (GBR/McLaren) 1:22.888
Felipe Massa (BRA/Ferrari) 1:23.324
Paul di Resta (GBR/Force India) 1:24.334
Kamui Kobayashi (JPN/Sauber) 1:24.436
Nico Rosberg (GER/Mercedes) 1:25.807
Jarno Trulli (ITA/Team Lotus) 1:26.090
Pastor Maldonado (VEN/Williams) 1:26.989
Jerome D'Ambrosio (BEL/Marussia Virgin) 1:28.982