Nico Rosberg was the fastest man during opening practice for the Austrian Grand Prix, beating team-mate Lewis Hamilton by more than three-tenths to secure the top spot.
The Mercedes driver beat last year's pole position time by more than a second as he recorded a 1m07.373s, the softer tyres and new track surface contributing to the tumbling times.
Ferrari's Sebastian Vettel and team-mate Kimi Raikkonen were third and fourth quickest, the pair split by exactly 0.200 seconds as they emerged the second quickest team ahead of Daniel Ricciardo's Red Bull.
Carlos Sainz continued to impress on the back of his new Toro Rosso deal, posting the sixth quickest time ahead of Felipe Massa's Williams and the second Red Bull of Max Verstappen. The Dutchman completed 13 laps less than his team-mate after concluding his session early following damage after running across the new kerbs.
Hamilton caused a brief VSC when he span at Turn 8, which in turn caused Romain Grosjean to spin as he took avoiding action. Neither suffered damage and shortly returned to action.
Race control launched an investigation into an incident between Ricciardo and Sauber's Felipe Nasr as they almost made contact when the Brazilian ran wide entering the pitlane.
Verstappen had two trips over the new kerbs, the first damaging his front-wing and the second his steering, which saw him end up in the gravel trap at Turn 4.
