World champion Lewis Hamilton was unbeatable even in a misfiring car as he topped practice at the Malaysian Grand Prix despite mechanical problems on Friday.
Hamilton spent much of his time in the garage and departed first practice on a moped, but he still managed to set the day's quickest time by nearly four-tenths of a second.
The performance at a sun-drenched Sepang underlined the superiority Hamilton showed in winning the season-opener in Australia as he sets out to secure a third world title.
"It was an amazing job by the guys to get me back out this afternoon - particularly here in such tough conditions, so I'm very grateful to them," Hamilton said.
Hamilton managed just four laps of the 90-minute first practice before he was told to halt his Mercedes W06 and hitched a lift back to the pits on the back of a moped.
His problems continued in the second session as he sat out the first 40 minutes and then quickly had to return to the garage when his team could not see his telemetry data.
Hamilton then re-emerged to set a field-scorching lap of 1min 39.790sec - before returning to base shortly afterwards complaining of gear problems.
"It's not an easy track and the temperatures also make it difficult with the tyres, so it never helps to lose such a big chunk of a session," Hamilton said.
"But fortunately I got a few laps in at the end on a longer stint."
Behind him, Ferrari's Kimi Raikkonen was the best of the rest, 0.373sec behind, followed by Hamilton's Mercedes rival Nico Rosberg, who had timed quickest in the opening session.
"In general it was a difficult day for the team as we had reliability issues on Lewis's car and which meant he missed a session," Rosberg said.
"The conditions are really crazy out there. It's so hot, the temperatures are really unbelievable. So us drivers and the cars have to adapt to that which is a big challenge."
Daniil Kvyat was fourth-fastest in his Red Bull and easily bested Aussie teammate Daniel Ricciardo, who could only manage the tenth fastest time of the session, over a second behind Kyvat.
Kvyat was followed by Williams drivers, Valtteri Bottas and Felipe Massa, and Ferrari's four-time world champion Sebastian Vettel.
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