Lewis Hamilton was left frustrated by Mercedes' decision to pit late during the Turkish Grand Prix, helping Max Verstappen take over the Formula One championship lead in Istanbul.
Hamilton had claimed pole in qualifying but was handed a 10-place grid penalty due to an engine change, meaning Mercedes team-mate Valtteri Bottas started in first place.
It was a lead Bottas only relinquished briefly to Charles Leclerc, though the Finn regained it with a brilliant move on the inside of the Ferrari with 11 laps remaining to ensure his first win of the season.
With Verstappen claiming second, it was Hamilton's decision to hold off pitting in the wet conditions that proved crucial in the title race.
Well in the hunt for a podium place at the time, Hamilton was finally instructed to come in by Mercedes on the 51st lap.
Yet the decision to switch to intermediate tyres did not pay off, with Hamilton left furious with his team, stating: "Why did you give up that place?”.
While one half of the Mercedes garage will be left pondering their decision, the other was celebrating a flawless drive from Bottas, who endured a miserable race in Turkey last year.
Behind Bottas, it was a fantastic outing for Red Bull, with Verstappen securing a six-point lead over Hamilton in the championship standings and Sergio Perez completing the podium places.
Hamilton ultimately finished fifth, holding off Gasly but unable to gain ground on Leclerc, who missed out on the top three after pitting late on himself.
Perez and Hamilton do battle
Hamilton thought he had nipped ahead of Perez heading into lap 35, with the pair going wheel-to-wheel for five corners in a fantastic tussle.
Though Hamilton had the faster acceleration, Perez pushed at Turn One to regain the place and even though the Red Bull driver subsequently pitted, he had done enough to keep the seven-time world champion at bay and hand Verstappen a real boost.
Alonso hits out at Gasly
Fernando Alonso made a strong start in Istanbul, but he found himself spinning off the track on the first corner after a clip from Pierre Gasly.
By the time he rectified the situation, Alonso had dropped from fifth to 15th. Gasly, for his part, explained that he got "sandwiched", though the Frenchman was nevertheless handed a five-second penalty that cost him a place in the top five.
Leclerc pledges to learn from Piastri battle after Baku near miss
Charles Leclerc pledged to learn from his mistakes after squandering pole position at Sunday's Azerbaijan Grand Prix, finishing second to Oscar Piastri.
Leclerc started at the front of the grid in Baku for the fourth time in a row, having also claimed a memorable triumph for Ferrari at their home circuit of Monza last time out.
However, Piastri passed Leclerc on a straight on the 20th lap, and a spirited fightback was not enough for the Monegasque driver as the McLaren held on for his second win of the year.
The result means Leclerc remains third in the drivers' championship standings with 235 points, behind Max Verstappen (313) and Lando Norris (254), while Ferrari remain third in the constructors' table.
Speaking about his battle with Piastri after the race, Leclerc said: "It is enjoyable when you've got many opportunities every lap.
"I think maybe McLaren had less downforce and in the straights they were very quick, in the corners we were a bit quicker.
"I couldn't get as close as I wanted and eventually we lost the race when I didn't defend as well as I could have at the end of the straight. Sometimes you make mistakes and I'll learn from it."
Asked at what stage he realised victory was unlikely, Leclerc said: "I think as soon as we put the hard tyres on. On the medium we were very competitive, and the car felt good.
"Unfortunately for me, we didn't do any high fuel running in FP1 and FP2. We went for a setup direction which in the race was a bit more difficult to manage.
"McLaren and Oscar have done an exceptional job and done better than us."
Ferrari team-mate Carlos Sainz, meanwhile, was pushing for a podium finish when he crashed with Baku specialist Sergio Perez, taking both drivers out of the race.
"It's a huge shame for Carlos on the last laps," Leclerc said. "Hopefully everyone is okay, and obviously it's not a great day for the team."
Baku triumph 'the most stressful afternoon', says race winner Piastri
McLaren's Oscar Piastri labelled his victory at the Azerbaijan Grand Prix the most stressful afternoon of his life after claiming his second career win in Formula One.
Piastri, who started second on the grid, emerged victorious ahead of Ferrari's Charles Leclerc to put McLaren at the summit of the constructors' championship.
The Australian's team-mate, Lando Norris, managed a fourth-place finish in Baku having endured a difficult qualifying that saw him start in 17th on Sunday.
Piastri's triumph saw him move up to 222 points in the drivers' championship, and he is now 13 points behind Leclerc in third place.
The McLaren driver performed a huge lunge on the inside on lap 20 to take the lead from the Monegasque, defending admirably to secure the victory in Azerbaijan.
“I tried at the start of the race to get in front but once I dropped out of DRS I just didn’t have the pace,” said winner Piastri.
“After the stop, I saw we were pretty close again and I felt like we had a little bit of extra grip.
"I had to go for it because I knew that if I didn’t get past at the start of the stint, I was never going to get past.
“I went for a pretty big lunge but managed to pull it off and then hang on for dear life for the next 35 laps.
"The last couple of laps, once [Leclerc] dropped out of DRS, were a little bit more relaxing, but there’s no such thing as a relaxing lap around here so it was hard work.
"It definitely goes down as one of the better races of my career.”
Piastri (two) and Norris (two) are the first pair of drivers to get two wins in the same season for McLaren since 2012 (Lewis Hamilton, four, and Jenson Button, three).
The Australian's victory also continued the British-based team's record of having one or both of their drivers on the podium in each of the last 13 races.
It equalled their second-best run in the competition (13, which they recorded on two other occasions, between the United States and Portugal in 1990, and Germany 2011 and China 2012).
Up next on the F1 calendar is the Singapore Grand Prix, a race that saw Norris claim second last year, with Piastri finishing down in seventh.
Piastri fends off Leclerc in thrilling Azerbaijan GP
Oscar Piastri held off Charles Leclerc to claim his second win of the Formula 1 season in a dramatic Azerbaijan Grand Prix.
And the Australian's victory means McLaren have leapfrogged Red Bull in the constructors' championship after an impressive run.
Leclerc started on pole in Baku for the fourth time in a row, and, after winning in Monza last time out, put himself in a good position to get a second consecutive win after a strong start.
However, Piastri took advantage on a straight in the 20th lap, stealing in front of the Ferrari, who he managed to hold off in the latter stages despite a spirited fightback from Leclerc.
Meanwhile, Lando Norris started in P15 after struggling in qualifying, but after a brilliant opening stint, he then slipped in front of his championship rival Max Verstappen with two laps remaining, eventually finishing fourth.
There was still a thrilling finish, as Sergio Perez, who has scored the most points in the Azerbaijan Grand Prix, and Carlos Sainz both pushed to clinch the final podium spot and tangled in a huge crash on the penultimate lap, taking both of them out of the race.
George Russell benefitted from that to claim third, while his Mercedes team-mate Lewis Hamilton finished in ninth after a pit-lane start for taking a new engine ahead of the race.
Data Debrief: McLaren gain the edge
McLaren now have a 20-point lead over Red Bull in the championship. It is the first time the team have held the lead after at least 17 Grands Prix since Brazil in 2005.
It was quite the result for Piastri, who has now finished in the top two in four of his last five F1 races (winner in Hungary and Azerbaijan, runner-up in Belgium and Italy). That is more than he managed in his previous 34 Grand Prix.
Norris will be pleased with his own exploits though, given where he started on the grid, and by nipping in front of Verstappen, he keeps his hopes alive in the drivers' championship. The gap is now 59 points.
Top 10
1. Oscar Piastri (McLaren)
2. Charles Leclerc (Ferrari)
3. George Russell (Mercedes)
4. Lando Norris (McLaren)
5. Max Verstappen (Red Bull)
6. Fernando Alonso (Aston Martin)
7. Alex Albon (Williams)
8. Franco Colapinto (Williams)
9. Lewis Hamilton (Mercedes)
10. Oliver Bearman (Haas)
CHAMPIONSHIP STANDINGS
Drivers'
1. Max Verstappen (Red Bull) - 313
2. Lando Norris (McLaren) - 254
3. Charles Leclerc (Ferrari) - 235
Constructors'
1. McLaren - 476
2. Red Bull - 456
3. Ferrari - 425
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