Mercedes boss Toto Wolff says his drivers are pushing each other to "new heights" this year as they battle for the championship.
Nico Rosberg and Lewis Hamilton are both in the running for the 2016 title, with just eight points separating them with six rounds remaining. Between the two of them they have won every race bar the Spanish Grand Prix -- where they collided while fighting for the lead -- and Wolff believes both are at the top of their games.
"Like Singapore, this was a race where we underperformed last year, so we will need to push hard to put that right," he said. "We can guarantee that the drivers will be doing just that. This year more than ever, we've seen that they are pushing each other to new heights.
"We're entering a gruelling phase of this record 21 race season, where the physical and mental challenge of a Championship reaches its absolute peak. We're in good shape - but we must remain on our toes to get the ball over the line."
Rosberg has hit a run of form over the last three races, with three consecutive victories ahead of Hamilton. But the championship leader is not convinced the momentum will last and is also wary of Red Bull and Ferrari at this weekend's Malaysian Grand Prix
"I won't take it for granted. I've had a good run lately and I'm enjoying the moment. But as far as the next race goes, or the next one after that and so on... it's anyone's game. Red Bull and Ferrari are both pushing us really hard, so there will be some tough weekends ahead.
"It's exciting for the fans and pushes us even harder to keep improving, so that's a great thing. Malaysia didn't work out perfectly for us last year, so if we can win it this time against such tough opposition that would be really awesome."