A realistic Sebastian Vettel has admitted that a top five finish for Red Bull would be a good result at this weekend's Chinese Grand Prix.
Vettel, who claimed Red Bull's maiden victory at the circuit five years ago, currently sits in sixth place in the championship, 38 points down on early leader Nico Rosberg.
The reigning champion believes it will be tough for Red Bull to close down the gap to Mercedes.
"It is a big gap at the moment," he said.
"In Bahrain it looked quite bad for everyone bar Mercedes, but here in China it could be only a little bit different. Historically this track was one of the tracks that has favoured them, and we can expect them to be strong because of the nature of the track. Also they will be strong because they are in very good shape, which means that they are the favourites going into this race."
Vettel reckons the team has made progress with their RB10 but they remain unsure where this will leave them in comparison to their rivals.
"For us we know that we have made some improvements at the tests with our car and our power unit," he said. "All in all we expect to have made a step forward, but how big that step is we will see soon.
"It would be a massive surprise though if we could close the gap. We have to be realistic, and take a look at the previous races where we have lost almost one second per lap. To close this gap in one go is hopefully not totally impossible, but also being realistic this is very difficult. Being in the top five is what would be good for us."