Rosberg said he was aware of the championship points position and his clear lead but was not satisfied by finishing second.
Nico Rosberg dismissed the notion that he was happy to finish second in Sunday's United States Grand Prix and stay on course for his maiden drivers world title.
The 31-year-old German said he was aware of the championship points position and his clear lead but was not satisfied by finishing second to Mercedes teammate Lewis Hamilton.
"I wanted to win this race and I want to do it well, but it did not work out that way this time," said Rosberg.
"But it was Lewis's weekend this time and he drove well and he was quick all the way. I'm aware of the situation and that I lead by 26 points with three races to go and it's nice to be in that position.
"I am only going to approach it one way and that is to try and win each race at a time -? so I will be aiming to win next week's race in Mexico."
If Rosberg wins in Mexico and Hamilton fails to score a point then the German will be crowned world champion for the first time.