Mercedes' Nico Rosberg moved to dampen a brewing row with fellow German Sebastian Vettel and said he expects Sunday's Korean Grand Prix to be a straight fight between his team and the Red Bulls.
Rosberg was infuriated with remarks reportedly made by his Red Bull rival suggesting that the other teams were lazy.
"I commented that I consider that notion a bit off the hook, but let's stop the matter there," said Rosberg after two practice sessions on Friday dominated by Mercedes and Red Bull.
He added: "I don't want to discuss that matter any longer. It is history. I want to focus on the race -- and on optimising my car."
Vettel is 60 points clear of his nearest challenger in the drivers' championship and Red Bull are also streaking away with the constructors' title.
But Rosberg, who was third-fastest on Friday and saw team-mate Lewis Hamilton go quickest of them all, said: "Yes, looks like another fight between us and Red Bull.
"Red Bull is pretty strong, but from what we've seen today there should be a chance for us."
He added: "What is good to see is that we still can keep up with them -- that our development speed is similar to theirs, even though much of our resources are already focused on 2014.
"But I guess that is the case with all the other teams as well. Our aim for the rest of the season is clearly to win races."