Lewis Hamilton's hopes of a second successive pole position disappeared today when he was handed a five-place penalty on the Bahrain Grand Prix starting grid for an unscheduled gearbox change.

Mercedes said they had to make the change after the 2008 Formula One world champion hit a kerb in final practice and damaged his car's suspension.

Hamilton took the top slot in China last weekend, his first pole for the team he joined from McLaren at the end of 2012.

"Lewis's gearbox will be changed before qualifying following the incident in P3 ... Lewis will incur a five-place grid penalty as a result," Mercedes said on Twitter.

Red Bull's Mark Webber has a three-place penalty in Bahrain for causing a collision in China while Sauber's Esteban Gutierrez has a five-place sanction for driving into the back of Adrian Sutil's Force India in the same race.

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