Sebastien Buemi on track (Photo by Mark Thompson/Getty Images)
Nico Rosberg on track
Felipe Massa leads the way in his Ferrari (Photo by Ferrari)
Sebatien Buemi puts the STR5 through its paces
Nico Rosberg - Mercedes GP
Felipe Massa waits to return to the track
Nico Hulkenburg reviewing data (via @clairevwilliams on twitter)
Kamai Kobayashi in the Sauber (via @clairevwilliams on twitter)
Lewis Hamilton on track (Photo by f1photos.org)
Robert Kubica heads out on track (Photo by f1photos.org)
Rubens Barrichello (Photo by Glenn Dunbar/LAT Photographic )
Sebastien Buemi (Photo by Mark Thompson/Getty Images)
STR5 takes to the track (Photo by Mark Thompson/Getty Image)
Jaime Alguersuari (Photo by Mark Thompson/Getty Images)
Felipe Massa in action (Photo by Ferrari)
The helmets of Nico Hulkenburg and Rubens Barrichello (via @clairevwilliams on twitter)
Nico Rosberg heads out of the pits (Photo by Mercedes GP)
Kamai Kobayashi on track (Photo by BMW Sauber)
Sebastien Buemi pit board (Photo by Vladimir Rys/Bongarts/Getty Images)
