Lewis Hamilton and Nico Rosberg hammered home Mercedes' early season dominance on Friday when they set the fastest times in opening practice for Sunday's Bahrain Grand Prix. (Racecentre)
Hamilton, the winner in Malaysia last weekend, clocked 1min 37.502sec to top the time charts with world championship leader Rosberg, who won in Australia, in second spot thanks to a time of 1min 37.733.
Ferrari's Fernando Alonso, a three-time winner at the dusty Sakhir circuit, was third-fastest with Nico Hulkenberg taking fourth place in a Force India.
Britain's Jenson Button, racing in his 250th grand prix this weekend, was fifth-fastest in the McLaren, ahead of Ferrari's Kimi Raikkonen.
Meanwhile, four-time world champion Sebastian Vettel saw his early-season troubles continue with a 10th place in his Red Bull.