Lewis Hamilton lost his grip on the world championship lead in Istanbul as a botched strategy call from Mercedes allowed Max Verstappen to take a six-point lead with just five races remaining.
Hamilton, 36, was heard fuming over the team radio as a late pit stop saw the Briton lose two positions on the track, allowing for his Red Bull rival to open up a greater lead heading into Texas later this month.
There was plenty to digest from yet another thrilling weekend. Here, Sportsmail runs through the five things we learned from Sunday's race in the wet.
Lewis Hamilton lost his grip of the world championship lead after a dramatic race in Istanbul
Mercedes lose their nerve over Hamilton's risky tyre call
Istanbul holds happy memories for Lewis Hamilton. Last year, a stunning drive in wet conditions saw the Briton rise from sixth to first to clinch his seventh world title - putting him level with Formula One legend Michael Schumacher.
Yet he will want to quickly forget his experience in Turkey this year, with a disastrous strategy call resulting in Hamilton giving up ground to Verstappen in the title race.
Mercedes' decision to pit the world champion backfired as he slipped down to fifth
Hamilton wanted to stay out on the intermediates but Mercedes opted for a fresh set
The 36-year-old was heard seething over the team radio following the Silver Arrows' decision
Mercedes appeared to initially back Hamilton's bold call to stay out on his first set of intermediates, but with 10 laps remaining the Silver Arrows lost their nerve and called their man into the pits.
That decision backfired with the 36-year-old losing two track positions and he was left seething with the call made by his team. Mercedes maintain that the damage would have been far worse for Hamilton had he stayed out due to the incoming rain, but the lack of streamlined thinking between driver and team was made clear for all to see in Istanbul.
With the stakes rising, Hamilton was unable to cash in on his big gamble.
Red Bull on song with strategy
While Mercedes and Hamilton failed to make the big decisions count in Istanbul, the same cannot be said for championship rivals Red Bull.
Fresh from a superb call last time out in Sochi to put Verstappen on intermediates which saw the Dutchman take second place, Christian Horner & Co were once again spot on with their decision making.
While Mercedes made a strategic error, Red Bull got their tactics spot on in Turkey
Christian Horner's decision to recruit Sergio Perez was vindicated once again in Istanbul
Bringing Perez in early for a fresh set of inters was a risky call and would have gone awry had the track dried, but conditions remained wet and the Mexican managed to leapfrog Charles Leclerc onto the podium.
In fact, Perez's performance this weekend provided further vindication for Horner's decision to recruit the former Racing Point star. With Hamilton breathing down his neck, Perez executed some outstanding defensive driving to keep the world champion at bay and protect team-mate Verstappen.
It has been a long time since we have seen hard racing between Red Bull and Mercedes not result in a crash, and Perez's
