Barcelona, Day Two: Sergio Perez shows MP4-28 speed as Red Bull hit problems

Sergio Perez signed off from Formula 1's first week at Barcelona by taking McLaren back to the top of the timesheets for the first time since the opening day of winter testing, as Red Bull's RB9 ground to a halt for the very first time.

Mercedes, along with McLaren, were the only leading teams to avoid delays with reliability concerns also affecting Ferrari as a problem with an exhaust pipe restricted Fernando Alonso to just 76 laps. His fifth-fastest time was set on the medium compound. Valtteri Bottas got his first taste of the new Williams and the FW35's immediately impressive reliability allowed him to all-but reach a century of laps, the Finnish rookie outpacing Toro Rosso's Daniel Ricciardo and Force India's Paul di Resta to claim sixth place. "I had a really strong first impression of the FW35 today," remarked a happy Bottas. "Straight out of the box I knew we had made a step forward from last year." Sauber, meanwhile, became the latest team to run a rear-wing stalling device - or passive double DRS - on their C32 as Nico Hulkenberg completed plenty of laps (88) without setting the timesheet alight. The German largely focused on aero, tyre and set-up work. Marussia's Max Chilton brought out the day's only other red flag when he stopped in the closing minutes of the session between Turns 12 and 13 in a planned fuel stoppage. Like Hulkenberg, the British rookie had spent much of the day focusing on specific items but prior to stopping did move ahead of Caterham's Charles Pic with his fastest lap of the test. Barcelona Day Two Timesheet
1. Sergio Perez, McLaren, 1:21.848, 97 laps (Soft tyres).
2. Sebastian Vettel, Red Bull, 1:22.197, 84 laps (Soft tyres).
3. Kimi Raikkonen, Lotus, 1:22.697, 43 laps (Medium tyres).
4. Lewis Hamilton, Mercedes, 1:22.726, 121 laps (Hard tyres).
5. Fernando Alonso, Ferrari, 1:23.247, 76 laps (Medium tyres).
6. Valtteri Bottas, Williams, 1:23.561, 98 laps (Soft tyres).
7. Daniel Ricciardo, Toro Rosso, 1:23.718, 70 laps (Medium tyres).
8. Paul di Resta, Force India, 1:23.971, 62 laps (Medium tyres).
9. Nico Hulkenberg, Sauber, 1:24.205, 88 laps (Medium tyres).
10. Max Chilton, Marussia, 1:25.115, 67 laps.
11. Charles Pic, Caterham, 1:26.243, 102 laps.