Sebastian Vettel and Ferrari team-mate Charles Leclerc dominated Friday’s floodlit second free practice.
Hamilton said he was surprised that title rival Vettel did not put up a tougher fight in the United States Grand Prix.
Lewis Hamilton moved a step closer to his fourth world championship on Sunday when he won the United States Grand Prix.
Hamilton now has 306 points and Vettel, the only other man to have won at Austin’s Circuit of the Americas, has 247.
Lewis Hamilton romped to victory at the Japanese Grand Prix on Sunday to close in on a fourth world title.
Lewis Hamilton won a chaotic and rain-hit Singapore Grand Prix on Sunday after Sebastian Vettel crashed out on the first lap.
Hamilton will aim to plunge a dagger into Vettel's world title ambitions by upsetting his expected march to victory in Singapore.
Hamilton, whose victory in Sunday’s Italian Grand Prix lifted him three points clear of Sebastian Vettel of Ferrari.
A headstrong Sebastian Vettel, rejecting the evidence of official data, accused the victorious Valtteri Bottas of jumping the start at the Austrian Grand Prix.
Valtteri Bottas converted pole position into his second win since joining Mercedes in the Austrian Grand Prix.
Vettel was in a laid-back mood, joking with home hero Fernando Alonso of McLaren who was sitting alongside him.