Lewis Hamilton was handed one of the most dramatic victories of his career on Sunday evening after Mercedes team-mate George Russell was disqualified for running an illegal car at the Belgian Grand Prix.
Russell appeared to have taken just the third F1 win of his life following a fascinating race where the 26-year-old rolled the strategy dice to beat Hamilton by just half a second.
But two and a half hours after the chequered flag fell at the Spa-Francorchamps circuit, and with both Hamilton and Russell already heading back home to Monaco, the latter was thrown out of the official result. Russell's Mercedes was found to be 1.5 kilograms underweight.
The stewards’ decision provided Hamilton with his second win from his last three appearances, and a record-extending 105th of his career, but denied the Silver Arrows their first one-two finish since the penultimate round of the 2022 season in Brazil.
"We have to take it on the chin," Mercedes team principal Toto Wolff said. "A mistake has happened and a one-two would have been a great result going into the summer break.
"We have to learn from that. As a team there were positives but for George it is a massive blow for it to be taken away. He is going to win more."
Russell, still dressed in his Mercedes overalls, had just completed his media rounds – where he lauded his display as the best of his career – when he was told his triumph was in grave danger.
A report from the FIA’s technical delegate Jo Bauer published at 17:50 local time (16:50 BST) spelled doom for the Englishman.
Russell’s car had breached the regulations and all those at Mercedes knew it was a slam-dunk disqualification.
Ron Meadows, the team’s sporting director, was summoned to the stewards at 18:10 local time and, at 18:55, Russell’s fate was officially sealed.
A statement from the FIA’s technical delegate Jo Bauer read: "After the race, car number 63 (Russell) was weighed and its weight was 798.0 kg, which is the minimum weight required by TR Article 4.1.
"After this, fuel was drained out of the car and 2.8 litres of fuel were removed. The car was not fully drained according to the draining procedure submitted by the team in their legality documents as TR Article 6.5.2 is fulfilled.
"The car was weighed again on the FIA inside and outside scales and the weight was 796.5kg. The calibration of the outside and inside scales was confirmed and witnessed by the competitor.
"As this is 1.5kg below the minimum weight requested in TR Article 4.1, which also has to be respected at all times during the competition, I am referring this matter to the stewards for their consideration."
Disqualification for Russell saw Hamilton add another triumph to the one chalked up at Silverstone three weeks ago.
The seven-time world champion assumed the lead of the race on lap three of 44, but Russell, who started sixth, had other plans and he adopted a bold one-stop strategy to outfox his rivals and claim just the third victory of his career.
Russell crossed the line a mere half a second ahead of Hamilton, with McLaren’s Oscar Piastri third and only six tenths behind the runner-up. Ferrari pole-sitter Charles Leclerc took fourth place.
Max Verstappen started 11th following an engine penalty and crossed the line in fifth, one place ahead of a disappointed Lando Norris, to extend his championship lead over the British driver heading into Formula One’s four-week summer shutdown.
Mercedes are a team rejuvenated. Following a painful start to the season for the Silver Arrows, this marked the constructor’s first one-two finish since the penultimate round of the 2022 season in Brazil.
Russell claimed his maiden win on that day in Interlagos, and here, seemingly against all the odds, it looked like being his turn again.
For much of this fascinating contest, it seemed it would be Hamilton who would win after he started third, and blasted past Red Bull’s Sergio Perez on the run up to Eau Rouge on the opening lap before moving clear of Leclerc on lap three.
But on lap 26, Hamilton peeled into the pits for his second change of rubber with Russell calling on his team to consider a one-stop strategy.
With a dozen laps remaining, Russell, on ageing rubber, was seven seconds clear of Hamilton.
"Am I on target to beat him?" Hamilton asked. "It will be close," came the reply from his race engineer, Peter Bonnington.
With a handful of laps remaining, Hamilton was occupying Russell’s mirrors but he never got close enough to threaten.
"I had tyres left, but the team called me in," Hamilton said. "Unfortunate. But that is what it is."
A jubilant Russell was lauded as "the tyre whisperer" by team principal Toto Wolff over the radio.
"Amazing result," Russell said. "We did not predict the win this morning but I kept saying we could do the one-stop and the strategy guys did a great job."
For Norris, he will be feeling this was a missed opportunity to take a chunk out of Verstappen’s championship lead.
Norris lined up from fourth on the grid, but a week after a poor getaway at the Hungaroring allowed Piastri to take control of the race and claim his maiden win, the Englishman was left to rue another bad start.
The 24-year-old held his position ahead of the opening La Source corner, but he dipped his rear-left tyre into the gravel which cost him dearly on the 220mph drag through Eau Rouge and into the Kemmel Straight.
Suddenly, Norris was seventh and midway through the second lap Verstappen – who had started seven places behind him – was just one position back in eighth.
McLaren’s strategy will also be back in the spotlight after Verstappen undercut Norris at the opening round of stops.
Verstappen stopped on lap 10 but Norris was not hauled in for his first of two tyre changes until lap 15. When he left the pits, he was six seconds behind the Dutchman and he did not have the pace to get back past his title rival.
