Red Bull's Sebastian Vettel cruised to victory in the Singapore GP after Lewis Hamilton's McLaren retired.
Hamilton headed Vettel from the start but a gearbox failure dealt a major blow to the Briton's world title hopes.
Fellow British driver Jenson Button took second in his McLaren from Ferrari's Fernando Alonso, who leads Vettel by 29 points in the standings.
Hamilton slips to fourth, 52 points off the lead with only 150 available, seven points behind Lotus's Kimi Raikkonen.
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