Sauber's Felipe Nasr says "unnecessary" contact with Renault's Kevin Magnussen compromised his prospects at the Canadian Grand Prix, as he trailed home in 18th place.
Nasr started from 18th on the grid but collided with Magnussen at Turn 3 and was tipped into a spin.
Nasr's C35-Ferrari suffered floor damage in the collision and the Brazilian eventually classified a low-key 18th.
"It was a disappointing race for me," rued Nasr.
"My race start was ok, but then suddenly in Turn 3 I was hit from behind.
"It was very unfortunate and an unnecessary move. This compromised my race from there on.
"I tried my best to recover, and in the end I was able to put in decent lap times on the Soft tyres."
Sauber team-mate Marcus Ericsson was 15th as the squad's search for its first 2016 point goes on.
"For me it was a good race from the start to the finish," he said.
"I think the first stint on Ultra Soft tyres was not ideal, as I struggled a lot with the grip.
"Our initial plan was a one stop strategy, but we then had to revert to a two stopper.
"Once we got onto the Soft tyres for the next two stints of the race, I had a good run and was able to pass Kevin and Pascal [Wehrlein].
"Overall a good effort, as we also came close to Haas."