Mercedes' Nico Rosberg and Lewis Hamilton topped the times in first practice in China
2012 winner almost half a second clear of new team-mate
By Mike Wise in Shanghai
Last Updated: 12/04/13 6:56am
Rosberg, last year's race winner, lapped the 5.451km track in a time of 1:36.717s. He was 0.454s faster than his team-mate, with Hamilton in turn quicker than Red Bull's Mark Webber and Sebastian Vettel.
The top four was therefore a neat inversion of the finishing order in the Malaysian Grand Prix, the reverberations of which are currently being felt at the Red Bull end of the paddock at the Shanghai International Circuit.
Fernando Alonso finished the session in fifth behind Vettel, with Jenson Button (McLaren), Felipe Massa (Ferrari), Adrian Sutil (Force India), Romain Grosjean (Lotus) and Paul di Resta (Force India) completing the top ten.
Thursday's talk was all about team orders - largely about those Vettel ignored at Sepang three weeks ago, but also the ones Rosberg had respected in the same race to his own detriment.
If the German is looking to re-assert himself against his new team-mate, then he has no better track on which to try. Rosberg dominated here 12 months ago, taking pole position by a similar margin to that he enjoyed over Hamilton on Friday before leading the race from start to finish. He also led the race in both 2010 and 2011.
Mercedes ran a new front wing during the session and weren't alone in trialling upgrades, with Ferrari also running a new front wing while McLaren tried out a new floor.
Sauber have a new rear wing and floor developments, with Force India changing the floor of di Resta's car during the session.
And while Sky Sports F1's Ted Kravitz initially spotted nothing particularly new on Red Bull's RB9 - he did, however, see boxes arriving at the back of their garage, suggesting changes for P2 - Rachel Brookes reported a full house on Williams' car.
As the team look to overcome their poor start to the season, Pastor Maldonado (13th) and Valtteri Bottas (17th) took to the track in FW35s sporting new front wings, rear wings and new floors.
With Button setting the session's first timed lap (1:41.798s) half an hour in, Force India were also prominent early on.
Sutil (1:38.125s) was fastest after 50 minutes, by which time all the runners were undertaking their preliminary runs. Massa and Rosberg both took turns at the top, with the latter then setting the time that was to prove the benchmark.
As ever, tyre degradation is bound to figure this weekend. Pirelli have nominated their medium and soft rubber and with cars running in warm, sunny conditions, graining was noticeable on some front tyres.
Red Bull, for one, reported wear and Friday's afternoon session will give more pointers as to whether problems similar to those they experienced in both Australia and Malaysia - which precipitated the team orders row there - might happen once again.
Elsewhere, Kimi Raikkonen was 11th after suffering a spin while Sergio Perez wound up 16th and also, embarrassingly, in the gravel after the chequered flag fell.
Entering the pitlane too quickly, the Mexican locked up and ploughed to a halt in the gravel trap his predecessor Hamilton made famous during the 2007 race.