George Russell crashed out of the Australian Grand Prix on the final lap, with his Mercedes flipping on its side.
The Brit was attempting to chase down Fernando Alonso in sixth place but hit the barriers and had to retire from the race.
It was a nightmare day for Mercedes, who earlier lost Lewis Hamilton due to engine failure early in the race.
Russell had been involved in a big battle with Alonso and was closing in on the Spaniard in the final stages.
George Russell suffered a huge crash on the final lap of the Australian Grand Prix
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But he lost control of his car at turn six and slammed into the barriers before flipping onto its side.
The Briton reported over the Mercedes team radio that he was okay but it meant the Silver Arrows ended the day with no points.
Alonso and Russell are under investigation for the incident and will meet with the stewards.
Some believe that Alonso brake-tested Russell, which led to the 26-year-old crashing out.
Russell admitted afterwards that Alonso suddenly came up to him 'extremely quick' and said it was 'bizarre' they were heading to the stewards.
He told Sky Sports: "My take is I've gone off and that's on me.
"I was half a second behind Fernando 100m before the corner then suddenly he came towards me extremely quick and I was right on his gearbox. I don't know if he had a problem or not.
"We're off to the stewards and that's a bit bizarre in a circumstance like this.
"I've got nothing more to say right now. I need to see everything, just disappointed to end the race like that.
"It's clear he braked 100m before the corner and was back on the throttle again and took the corner normally. We've already seen the data of that."
Asked about the idea of Alonso brake testing him, Russell replied: "I'm not going to accuse him of anything until we see further.
"I was right behind him for many, many laps. I was half a second behind him before the corner
"Then, suddenly he slowed up dramatically and got back on the power. I wasn't expecting it and he caught me by surprise.
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George Russell crashed into the barriers late on at the Australian Grand Prix
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"That part is on me. It's interesting he's been called by the stewards. I'm intrigued as to what they have to say."
Alonso admitted he was struggling in the latter laps of the race and was grateful Russell was okay.
He said: "Obviously I was focusing in front of me and not behind.
"I had some issues for the last 15 laps or something on the battery, on the deployment, so definitely I was struggling a little bit at the end of the race but I cannot focus on the car behind.
"But he's ok, apparently. I saw the car and I was very worried."
George Russell's car was carried away after a miserable day for Mercedes
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It was a race of retirements, with three-time world champion Max Verstappen exiting early after his car caught fire.
The Dutchman had won the first two races of the season, so we were set for a new winner.
Ferrari's Carlos Sainz, fresh from appendix surgery, stormed to victory ahead of team-mate Charles Leclerc.
McLaren's Lando Norris finished third on the podium ahead of his team-mate Oscar Piastri.
Red Bull's Sergio Perez finished fifth after two second-placed finishes in the first two races.