Sergio Perez was disappointed after squeezing every drop out of his MP4-28 only to find out he was just P7 in qualifying.
Perez headed in qualifying for the Monaco GP with a poor record at the track, having crashed out in both his previous Saturday afternoon sessions.
This time, though, the Mexican came through it with flying colours - or so he thought.
"It's not great to cross the finish line, feel like you've just done a mega lap, and find that you're only seventh," he lamented.
Perez's 1:15.138 on the drying streets, put him a full second behind pole-sitter Nico Rosberg. He did, however, outqualify team-mate Jenson Button by half a second.
"I put in a really strong performance here today, and I felt like I'd really maximised the full potential of the car.
"We know we're not quite there yet performance-wise, so we need to keep pushing.
"But the team has done a fantastic job so far this weekend, and I hope we can keep the momentum going tomorrow and score some good points."
He added: "Anything can happen at Monaco on Sunday."
Perez has netted just 12 points this season, five less than Button and a massive 77 short of Championship leader Sebastian Vettel.