Lewis Hamilton's first day of testing for his new Mercedes team got off to a bad start when he crashed the car after just 15 laps in Jerez, Spain.
Hamilton had just set the second fastest time of the day when he slid into the barriers at the hairpin at the end of the back straight.
He was unhurt after ploughing across a gravel trap into a tyre wall.
Mercedes had a troubled first day on Tuesday when the car broke down after 11 laps with Nico Rosberg at the wheel.
On the team's Twitter account , Mercedes, said: "Lewis is back in the garage, we're waiting for the car to return to find out what happened."
Hamilton, 28, signed a three-year contract with Mercedes in September having spent his entire F1 career at McLaren since his debut in 2007.
BBC F1 technical analyst Gary Anderson said: "Hamilton locked his brakes going into the hairpin and went across the gravel trap into the tyre barrier. The car has front wing and front suspension damage."
Rosberg's running on Tuesday was ended by an electrical problem in the wiring loom. The car was pictured with flames coming from it but these were caused by unburnt fuel in the exhausts after the engine shut off as a precaution.