Showing increasingly impressive form, Red Bull's Mark Webber looks in focused mood as practice gets under way in Istanbul for the Turkish Grand Prix
Winner of the past three Turkish Grands Prix, Ferrari's talented Brazilian driver Felipe Massa zooms round the Istanbul track in front of a small peppering of F1 fans
The unmistakeable silhouette of McLaren's reigning world champion Lewis Hamilton, who sits ninth in the drivers' championship after a poor first third of the 2009 season
Sebastian Vettel - the only driver to deny Jenson Button a Grand Prix victory in six races in 2009 after his win in China - squeezes his frame into his Red Bull car before heading out for some practice laps
Looking relaxed and ready for the seventh race of the season, Button is finally showing the raw driving skills he possesses in a superbly responsive Brawn GP car
Brawn GP's championship leader Jenson Button glides over the Istanbul track, which lies east of the Bosphorus and therefore is actually in Asia - not Europe
A Ferrari engineer inspects proceedings around an Istanbul Park track which was bathed in bright sunshine during Friday's practice sessions
Leaving it typically late, Williams' Nico Rosberg comes through ahead of the 19 other drivers to top the first practice timesheets - the 10th time he has done so in 20 sessions so far this season
Spain's Fernando Alonso has struggled, relatively, in his Renault this season but still manages to show class befitting a two-time world F1 champion
BMW Sauber's Robert Kubica, who has endured a torrid start to the season after finishing third in the 2008 drivers' championship, pulls into the pits during practice
Brazil's Rubens Barrichello, who has been pushing his English Brawn GP team-mate Jenson Button all the way this season, approaches a corner on an Istanbul Park lacking in sustainable grip
Standing at the side of the track, a Force India mechanic ponders the progress of his drivers Giancarlo Fisichella and Adrian Sutil in Friday's practice sessions
McLaren's Heikki Kovalainen - one of a few big names to have failed to register the points they would have liked this season - records the day's fastest time to top the second Friday practice session timesheets
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