Daniel Ricciardo was baffled by his lack of pace in Canada after finishing 13th on his return to the scene of his maiden victory last season.
Ricciardo started on the fifth row of the grid but finished the race out of the points, while team-mate Daniil Kvyat finished ninth. The Australian, the breakthrough driver of 2014, has been frustrated by the uncompetitive Red Bull-Renault package this year and thought Canada would be the start of a turnaround.
Asked if he thought things can improve going into Red Bull's home race in Austria, he replied: "After today I think so, I hope so. I thought we'd reached the low point but today was a new one. Hopefully it's only up from here."
The Australian had no answers for his inability to get as much out of the RB11 as Kvyat and said it reminded him of the Canadian Grand Prix in his final season at Toro Rosso.
"Nothing works, we didn't have pace, it's nearly a mirror race of 2013 for me. [Then-team-mate] Jean-Eric [Vergne] was sixth, his best result of the season, and I was like 15th and we were like a second slower and didn't really have any answers for it. Then the year after I win and now I'm struggling to keep up with anyone on track so I don't know, I mean at the moment all I can do is laugh because race cars are complicated. Some days you don't understand them.
"Unfortunately we haven't really got on top of it all weekend but we didn't expect to be that slow in the race. That was interesting, I mean obviously I knew I wasn't fighting for points but I was still pushing and trying to get as much as I could out of it. It was just one of those races where you're going round and round an yeah, like, I don't know. It's like banging your head against the wall, just nothing good's coming out of it."