Romain Grosjean set the fastest time on the second day of the first pre-season test in Jerez.
Grosjean led both the morning and afternoon sessions, going faster in the afternoon after switching to short runs on the softer tyre.
The Frenchman ended the day ahead of Paul di Resta who looked impressive in the Force India. Behind them Daniel Ricciardo set the third fastest time despite causing the first red flag of the day stopping on track between turns 10 and 11.
The second red flag of the day was caused by Lewis Hamilton who ended up in the gravel trap after just 15 laps because of a brake issue on the car. Mercedes were unable to fix the car and their day finished early for the second day running. Hamilton finished the day with the sixth fastest time despite the limited running.
The third red flag of the day was caused by Luzi Razia who had only been announced as a Marussia driver earlier in the day. Razia came to a stop in the Marussia along the pit straight but finished the day with the 12th fastest time.
Mark Webber completed the most laps on Wednesday with 101 and set the fourth fastest time ahead of Nico Hulkenberg in the Sauber who set the fifth fastest time and completed 99 laps.
Sergio Perez got his first taste of the McLaren setting the seventh fastest time ahead of Felipe Massa in the Ferrari with Pastor Maldonado completing 71 laps in the old-spec Williams and setting the ninth fastest time.
Force India switched drivers late in the afternoon with James Rossiter completing 19 laps of the Jerez circuit and setting the 10th fastest time. Behind him Giedo van der Garde set the 11th fastest time in the Caterham.
Towards the end of the session both Grosjean and Hulkenberg stopped on track. Sauber later revealed the car stopping had been planned as a ‘run-dry’ test.
Testing continues tomorrow in Jerez with Sebastian Vettel and Kimi Raikkonen getting their first taste of the 2013 cars.
It should be remembered that the times set in testing are unlikely to be a true gauge of each cars performance.