The Singaporerace, which starts at 1200 GMT, falls at a key moment of the season, which is now into its final third and heading into two more Asian legs in Malaysia and Japan.
Hamilton is pinning his hopes of moving up the field on the start, the pitstops and the potential of a safety auto which has been deployed at every race in Singapore so far.
Agreeing, Raikkonen added that there also were many other variables to consider that could affect the outcome of the race. Though one of just four drivers to have won the race since it joined the calendar in 2008, Hamilton has only won in Singapore twice.
Nevertheless, Hamilton - who became the season's first back-to-back victor following his triumph in Monza - is up for a fight. The former has been in fine form over the weekend and is expected to put pressure on Vettel. "I threw the sink at it and squeezed every bit of it", Hamilton said after struggling to match the Ferraris and the Red Bulls on the tight and twisty track. "Every year it's been hard for us generally". Red Bull are also fancying their chances.
Red Bull's Australian Daniel Ricciardo was in second place as the safety vehicle was deployed.
McLaren and Honda stole the spotlight from the championship battle early in the weekend before finally confirming news of their divorce on Friday.
Jolyon Palmer's future in the sport was cast in doubt here after it was confirmed that Carlos Sainz will replace him at Renault next season.
As Raikkonen and Verstappen came to a sudden halt at turn one - colliding with an unfortunate Fernando Alonso in the process - Vettel managed to keep his Ferrari on the straight and narrow.
After a hesitant start, the four-time F1 champion veered hastily left as he tried to counter Verstappen's strong start.
"I should start sooner than later to finish ahead of them, as the season end is coming closer", he said.
"I'm loving driving more than ever". "At the same time I want to give time to my team".
Asked if Vettel's misfortune was somehow payback for June's controversial Azerbaijan GP, when the German still finished one place ahead despite receiving a time penalty for driving into the Englishman's Mercedes, Hamilton replied: "I don't know if it's Karma but whatever it is I will definitely take it".
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