Nico Rosberg and Mercedes dominated free practice on Thursday at the Monaco Grand Prix.
The German driver led his teammate Lewis Hamilton in the second session after setting the fastest time in both the morning and afternoon. Fernando Alonso set the third fastest time in the Ferrari whilst his teammate Felipe Massa was fourth.
Mark Webber set the fifth fastest time in the first of the Red Bulls whilst the Lotuses of Kimi Raikkonen and Romain Grosjean were sixth and seventh. Grosjean later clattered the wall in his E21 damaging the left side and front suspension bringing out the red flag. Officials took the opportunity to assess damage to the kerb at Turn 13.
Jenson Button set the eighth fastest time for McLaren just over a second off the pace. Championship leader Sebastian Vettel was ninth fastest with his car undergoing work during the session.
The Force Indias were once again evenly matched with Paul di Resta narrowly outrunning Adrian Sutil for 11th. The German hit the wall during the first session but managed to make it back to the pits for checks to be carried out on his car. Sergio Perez was 12th in the second McLaren.
Nico Hulkenberg was 13th for Sauber whilst his teammate was 15th. Hulkenberg was party to a near miss after Alonso took action to avoid the slow moving Sauber late during the second session. The two Saubers were split by the Williams of Pastor Maldonado in 14th.
Toro Rosso had a disappointing afternoon with Daniel Ricciardo in 16th and teammate Jean-Eric Vergne setting the 17th fastest time. Behind them Valtteri Bottas was 18th for Williams.
At the back Marussia led the Caterhams with Jules Bianchi 19th, Charles Pic 20th, Max Chilton 21st and Giedo van der Garde 22nd.