Formula One world champion Lewis Hamilton knows he needs to pick up some extra speed for Saturday's Singapore Grand Prix qualifying after a sluggish practice.

The Briton posted seventh and ninth in the two sessions and though he suffered no specific problems on the floodlit street circuit, says he must improve somehow.
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"I'm still lacking some speed in certain areas, so I need to work on that," the driver said.
"The (practice) sessions were a little up and down for me... I didn't have any major problems, but I wasn't as fast as I'd hoped to be.
"When the track gets a bit cleaner ... we'll have a better understanding of the tyres. The main thing for us is to analyse the data, try and improve the car and find some more time."
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