Jules Bianchi admits it will be difficult for Marussia to stay ahead of Sauber this season, saying Caterham remain their main rivals.
The Banbury-based squad broke the F1 points duck this year when Bianchi finished ninth at the Monaco Grand Prix. The result moved them up to ninth in the Constructors' Championship - ahead of Sauber and Caterham who are yet to get off the mark this campaign.
Bianchi, though, feels it is only a matter of time before Sauber get their act together and their target remains the same: stay ahead of the Caterham.
"We know that if we finish in ninth it's because we've had a bit of luck," he told Crash.net. "We are still slower than Sauber and we struggle to catch them, so it is not easy.
"I am sure at one point they will score points so we aren't really focused on Sauber, we are focused more on Caterham trying to be in front of them at the end of the season, that will be the target for sure."