Monaco - Nico Rosberg took full advantage of one of Formula One's greatest tactical errors on Sunday to land an unexpected victory and become only the fourth man to claim a hat-trick of consecutive wins in the Monaco Grand Prix.
The 29-year-old German - who was winning his second successive race this season - came home in his Mercedes ahead of compatriot Sebastian Vettel in a Ferrari with long-time leader and Mercedes team-mate Lewis Hamilton third.
Rosberg, who reduced the gap between himself and Hamilton in the world championship standings to 10 points after six races, trailed his team-mate for 63 laps until an accident prompted a Safety Car intervention that, in turn, led the team to call the Briton in for an unexpected and unnecessary pit-stop.
Obeying his team, Hamilton, who led by 21 seconds before he pitted, came out in third place and, after the race was re-started with eight laps remaining, found it impossible to pass Sebastian Vettel's Ferrari, let alone Rosberg, to claim his fourth victory of the year.
"I've lost the race, haven't I?" asked Hamilton on seeing his reversal of fortunes after exiting the pit lane.
"What's happened, guys?"
Hamilton's team were swift to apologise for the misjudgment, but their actions had deprived him, and the spectators, of a fair sporting outcome after he had dominated the 62nd running of this classic 78 laps contest.
Rosberg's triumph enabled him to join Briton Graham Hill, Frenchman Alain Prost and Brazilian Ayrton Senna in completing a Monaco hat-trick.
"I am very happy," said Rosberg, who was also winning two consecutive Grands Prix for the first time.
"But I know it was just a lot of luck. Lewis drove brilliantly and would have deserved the win, for sure, but that's the way it is in racing.
"I know I got lucky. I will just enjoy the moment..."
Hamilton, who has won just once at Monaco, was remarkably relaxed about the mishap -- outwardly at least.
"It was not the easiest of races," said Hamilton.
"But the team has been amazing all year and we win and lose together."
Asked about his mind set, he added: "Come back and win the next one."
Mercedes director Niki Lauda said the team had apologised for the mistake.
"Yes, it was clear... I don't know why it happened. Too much confusion. It was the wrong decision," he said.
Team boss Toto Wolff said: "For the team, I apologise. It was a mistake."
Until the Safety Car, after Dutch teenager Max Verstappen in his Toro Rosso had crashed at Ste Devote, it had been Hamilton's race, but he ended up settling for a disappointed third ahead of the two Red Bulls of Russian Daniil Kvyat and Australian Daniel Ricciardo.
Finn Kimi Raikkonen finished sixth for Ferrari ahead of Mexican Sergio Perez of Force India and Briton Jenson Button who claimed the struggling McLaren Honda team's first points of the year in eighth place.
Brazilian Felipe Nasr came home ninth for Sauber and remarkably, after starting from the pit lane, Spaniard Carlos Sainz finished 10th to score a point in the second Toro Rosso car.
Results from Monaco Formula One Grand Prix, the sixth race of the season, on Sunday:
1. Nico Rosberg (GER/Mercedes) 1hr
49min 18.420sec, 2. Sebastian Vettel (GER/Ferrari) at 4.486sec, 3.
Lewis Hamilton (GBR/Mercedes) 6.053, 4. Daniil Kvyat (RUS/Red Bull)
11.965, 5. Daniel Ricciardo (AUS/Red Bull) 13.608, 6. Kimi Raikkonen
(FIN/Ferrari) 14.345, 7. Sergio Perez (MEX/Force India) 15.013, 8.
Jenson Button (GBR/McLaren) 16.063, 9. Felipe Nasr (BRA/Sauber AG)
23.626, 10. Carlos Sainz Jr (ESP/Toro Rosso) 25.056, 11. Nico
Hlkenberg (GER/Force India) 26.232, 12. Romain Grosjean (FRA/Lotus)
28.415, 13. Marcus Ericsson (SWE/Sauber AG) 31.159, 14. Valtteri Bottas
(FIN/Williams) 45.789, 15. Felipe Massa (BRA/Williams) 1 lap, 16.
Roberto Merhi (ESP/Marussia) 2 laps, 17. Will Stevens (GBR/Marussia) 2
Did not finish
Pastor Maldonado (VEN/Lotus): 9th lap,
Fernando Alonso (ESP/McLaren): 43th lap, Max Verstappen (NED/Toro
Rosso): crashed 64th lap
Lewis Hamilton (GBR) 126 pts, 2. Nico Rosberg (GER) 116, 3. Sebastian
Vettel (GER) 98, 4. Kimi Raikkonen (FIN) 60, 5. Valtteri Bottas (FIN)
42, 6. Felipe Massa (BRA) 39, 7. Daniel Ricciardo (AUS) 35, 8. Daniil
Kvyat (RUS) 17, 9. Felipe Nasr (BRA) 16, 10. Romain Grosjean (FRA) 16,
11. Sergio Perez (MEX) 11, 12. Carlos Sainz Jr (ESP) 9, 13. Nico
Hlkenberg (GER) 6, 14. Max Verstappen (NED) 6, 15. Marcus Ericsson (SWE)
5, 16. Jenson Button (GBR) 4
242pts, 2. Ferrari 158, 3. Williams 81, 4. Red Bull 52, 5. Sauber AG 21,
6. Force India 17, 7. Lotus 16, 8. Toro Rosso 15, 9. McLaren 4