George Russell retired from the lead of the Canadian Grand Prix in a major early blow to his Formula 1 championship ambitions.
Russell and Mercedes teammate Kimi Antonelli, the early runaway championship leader, had swapped the lead a few times in a thrilling fight before Russell's car dramatically came to a halt on the 30th lap.
"Everything turned off all of a sudden," Russell said on his return to the paddock. "Just went into the corner ... Yeah, engine stopped. No electronics, no brakes.
"Yeah, a bit lost for words to be honest right now. It's, yeah, I can't really say much more."
Antonelli came into the race 18 points clear and that stretched to 43 after the Italian took sealed the race win -- a buffer shy of two whole race victories in terms of points.
While not a decisive blow in the title fight with so long left, it leaves Russell facing a major uphill battle in his quest to win his maiden F1 championship this season.
It was a bitter end to what had been a stellar weekend -- Russell had won Saturday's sprint from pole position, before qualifying on pole again for Sunday's race.
"I've got to be honest, I'm proud of my weekend. You know, pole in the sprint, won the sprint, pole in qualifying, then was was leading when I stopped.
"From my side I don't feel like there was anything more I could have done this weekend. So, I'll leave satisfied of course. I'm pretty down, frustrated with what's happened but, yeah ... What more can I do?"
Russell and Antonelli had provided some great entertainment before his car failed, with a series of tight overtakes back and forth for the lead.
"I thought it was great. I loved it," Russell said on the fight with his teammate.
"I really enjoyed it. Felt like the karting days. We didn't make any contact, it was hard, close. I loved it. I loved it.
"That's what racing's about. I'd have loved to have continued it for another 30 laps".
Antonelli had little trouble after his teammate's retirement as he took his fourth consecutive race this season.