Ahead of today's second practice session, the air temperature is 23 degrees C, while the track temperature is 36 degrees.

Lewis Hamilton was quickest this morning, with the Red Bulls, teammate Nico Rosberg and Jenson Button in hot pursuit.

On a morning where the green track condition meant plenty of offs, Kimi Raikkonen crashed in the final moments doing substantial damage to the front and rear of his car.

Tyre options this weekend are medium (prime) and supersoft (option), while, unlike 2012, this year there are two DRS zones. The detection point of the first is 70m after Turn 2, with activation 360m after Turn 2. The second detection point is 60m before Turn 16 with activation 95m after Turn 18.

The bumpy, slippery surface at the new pit exit was causing problems this morning.

Replaced by their teams' reserve drivers this morning, Paul di Resta and Jules Bianchi are back in action this afternoon.

The lights go green and Bianchi leaps into action, the Frenchman having been confirmed for 2014 by Marussia.

As Chilton, Bottas, Maldonado, Ricciardo and Sutil join Bianchi, work continues on Raikkonen's car in the Lotus garage, the Enstone outfit working on the front and rear left hand corners. Thanks to "heroics from the mechanics" the teams claims the car will soon be ready.

Within five minutes there are eleven names on the timesheets, Hulkenberg (41.191), heading Vergne, Ricciardo, Sutil and Bottas.

Early frustration for Vettel who is held up by Grosjean, the German making his feelings quite clear.

On his next lap there are no such problems for Vettel, the world champion going quickest in all three sectors and crossing the line at 39.696, the quickest time of the weekend. Moments later, Hamilton, who looks to be his nemesis this weekend, goes second with a 40.196.

As Massa goes third (40.511), the cameras pick up Alonso who is really suffering on the bumps. Nonetheless, the Spaniard goes third (40.466).

Webber goes straight to the top of the heap, the Australian posting a 39.598, as Raikkonen heads down the pitlane. Moments later Hamilton raises the bar with a 39.510.

As Rosberg goes fourth (39.731), the top four are covered by just 0.221s.

Having got in the way of Hulkenberg, who is forced to run wide, Grosjean appears to be brake-tested by the Sauber drive. Fists are waved. Elsewhere, a moment for Rosberg as he enters the pitlane.

The "car is too pointy at high speed," complains Hamilton.