Lewis Hamilton will single-mindedly focus on Sunday's Singapore Grand Prix after putting behind him the disappointment of McLaren's failed appeal.

McLaren's protest at the 25-second drive-through penalty handed to Hamilton at the recent Belgian Grand Prix which relegated him from first to third was ruled as inadmissible on Tuesday and means Hamilton goes into the night race with just a one-point cushion over Ferrari's Felipe Massa when it could have been seven.

"I don't bank on anything other than myself and my team, and so I am focused on my challenge and my racing," insisted Hamilton.

"I'm not thinking about the title or the other drivers, just about doing the best job I can each time I get into the car.

"Clearly a number of drivers can still win the title, and so I have to make sure I do my best."

Appreciably, though, there was frustration from Hamilton with the decision of the judges as he had urged them on Monday to see the truth.

But they did not even get so far as debating the case surrounding his manoeuvre on Raikkonen at Spa that sparked a furious debate.

Effectively, Hamilton spent an hour in the dock at the hearing in Paris on Monday defending the legitimacy of his corner-cutting move for nothing. Instead, the judges went with the rulebook that states a drive-through penalty is "not susceptible to an appeal".

"People will probably expect me to be depressed about the result, but that isn't me," said Hamilton. "All I want to do now is put this matter behind me and get on with what we drivers do best - racing each other."