Oliver Bearman has said he was left "really hurting" after a 20-second pit stop wrecked his race at the São Paulo Grand Prix.
Bearman added that Haas is "giving it away" in the fight for seventh in the F1 constructors' championship.
The 21-year-old finished the chaotic, rain-affected race in Interlagos down in P17, having been running in the top 10 before a disastrous first stop during the switch from intermediates to slicks on lap 16.
The Briton was also handed a late blow when Haas was hit with a five-second penalty for an unsafe release into the path of Charles Leclerc during the final tyre change.
Speaking after the race, Bearman dismissed the suggestion it was a fight to get anything from the race
"That wasn't the reason that I finished P17," he said. "Okay, I dropped back to P10, but I still managed to overtake a few cars after that. And you know, I was right behind Nico [Hulkenberg] at that stage, who picked up a penalty too.
"The issue was that I had a 20-second pit stop. That's normally not ideal for the race.
"In the first stop, I lost a lot of time. I ended up stuck behind Sainz and a few others. I think Stroll as well. It was a super long day after that, unfortunately."
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Bearman - 'It's game over'
Asked whether points had been realistically on the table, with Haas just three ahead of Audi in the fight for seventh position in the constructors' championship, Bearman pointed to his pace relative to the Ferraris.
"I was in front of [Charles] Leclerc and [Lewis] Hamilton," said Bearman. "Obviously, they were much faster at the time that it went dry, but I was ahead of those guys. So it really hurts.
"We need to understand because it's a lot of pressure at the moment, a lot of fighting for this P7, and I feel like we're just giving it away at this stage."
Bearman said the strategy calls themselves had not been the problem.
"We communicated well," he said. "When to box, when to stay out, when to change tyres.
"We boxed on the correct lap both times, but we just had very, very slow pit stops, especially the first one.
"So the margins are very tight, and when you are stationary for 20 seconds in the pit lane, it's game over."
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