Nico Rosberg admitted he was "very pissed off" after he made minor contact with Mercedes team-mate Lewis Hamilton at the start of the Canadian Grand Prix.
Hamilton bogged down from pole position as both Mercedes drivers were overhauled by Sebastian Vettel on the run to Turn 1.
Hamilton adopted the inside line, with Rosberg on the outside, and the pair made contact, with the German driver taking to the run-off in avoidance.
Rosberg re-joined the track a lowly 10th and ultimately recovered to fifth place, via an extra stop for a slow puncture and a late spin while trying to pass Red Bull's Max Verstappen.
"Sebastian had a great start, I had a decent one and Lewis had a really bad one," Rosberg said when asked about the start.
"I was where my position was, on the outside. In Barcelona, I gave it a go around the outside of Lewis and it worked out really well.
"I went for the same again today and he did a really hard racing manoeuvre. We touched, I was off and that's it. I was very pissed off at that moment.
"It's my job to make sure that I'm in front after a battle like that next time.
"Of course it was very costly for me, because I lose a lot of places, and from then it was an uphill battle, trying to fight back, and it was difficult with fuel; I nearly ran out."
Rosberg's fifth place, allied to Hamilton's victory, meant his title advantage was cut to nine points.