Ferrari driver Sebastian Vettel admits he was left mystified by the team's lack of pace in qualifying for the Spanish Grand Prix.
Vettel could only manage the sixth-best time in Q3 on Saturday, a whole 1.334 seconds slower than pole-sitter Lewis Hamilton.
Not only were Ferrari humbled by Mercedes, but the Red Bull duo of Daniel Ricciardo and Max Verstappen were both faster than Vettel and team-mate Kimi Raikkonen, who edged the German for fifth.
Vettel said he was unsure why Ferrari were so off the pace but remains confident heading into Sunday's race in Catalunya.
"I think the car should be a lot quicker [on Sunday]. I don't know what happened this afternoon," said four-time Formula One world champion Vettel post-qualifying.
"We are disappointed as a team today because we didn't deliver what we can, we need to have a look and understand. We can't change it now.
"[Sunday] is another day, we know that the car is strong, we know that the car can be very strong, we just need to make sure that we get it in the right groove."
Ferrari team principal Maurizio Arrivabene was just as perplexed by the team's loss of pace.
"Something went wrong, for both drivers it went wrong," the Italian added.
"Look at this morning, we were much better. We have to check."