Marussia team boss John Booth has urged his outfit to keep pushing hard as they look to hold onto 10th in the teams' battle.
Marussia took the position off Caterham when Timo Glock brought his car home in 12th place in the Singapore Grand Prix.
The team, though, is not guaranteed to retain the position and were on tenterhooks in Abu Dhabi when Caterham's Heikki Kovalainen finished in 13th place.
"Last weekend's race in Abu Dhabi had us on the edge of our pitwall seats at various points, as it reminded us that to hold on to 10th in the Constructors' Championship, we cannot control what happens further up the field, ahead of our own private duel with Caterham," said Booth.
"We have to continue closing that gap and find the momentum to get ahead of them on track.
"We've come very close in recent races, despite their KERS-advantage, and we'll remain in dogged pursuit of this objective right up until the chequered flag in Brazil."
