Daniel Ricciardo survived a reliability scare to hold off Sebastian Vettel to take his second victory of the 2018 Formula 1 season in the Monaco Grand Prix.
Ricciardo was comfortably in charge early on before an apparent energy recovery systems problem took hold for the majority of the race.
The honey badger managed that loss of power to the end to clinch his seventh Grand Prix victory, with Vettel dropping back in second late on and Lewis Hamilton’s Mercedes a distant third.
Ricciardo covered Vettel into Ste Devote and had built a lead of 3.6 seconds before the leaders pitted to shed their used hypersofts from qualifying.
Vettel stopped on lap 16 of 78 with Ricciardo staying out a lap later and rejoining with a lead still above three seconds.
Ricciardo then started to report a loss of power and Vettel closed in.
Red Bull indicated the problem would not get worse and Ricciardo was able to maintain the lead, albeit at a reduced pace.
That allowed Vettel to run just over a second behind him, with Hamilton gradually closing in and putting the top three within three seconds of each other.
Hamilton was complaining more about the state of his tyres and gradually slipped back to a lonely third position.
Ricciardo’s loss of pace meant Kimi Raikkonen and Valtteri Bottas threatened to stop privately duelling over fourth and join the lead train, but never quite managed to do so.
Bottas had briefly threatened to be a dark horse after taking supersofts at his only pitstop while the top four went on ultrasofts, and was considerably faster in clean air.
His charge ended as soon as he caught Raikkonen and found himself stuck behind the Ferrari, and although they closed right up on Hamilton at the end they held position.
Esteban Ocon just held on to finish best-of-the-rest for Force India.
Ocon pitted later than most frontrunners but not as late as Pierre Gasly and Nico Hulkenberg, who ran exceptionally long opening stints and had fierce pace in the second half of the race.
Toro Rosso driver Gasly had supersofts to the hypersofts on Hulkenberg’s Renault, but just about managed to keep seventh place as Ocon kept the pair at bay.
Max Verstappen scored points after his crash on Saturday condemned him to a back-of-the-grid start.
The Red Bull drove gradually rose up the order and finished ninth after wresting the place from Carlos Sainz Jr with a forceful move at the Nouvelle chicane.
Sainz survived one attack there by cutting the chicane, but a lap later Verstappen made it stick on the outside – he ran slightly deep into the corner and half-cut it, half-clobbered the kerb on the first right-hand apex, but kept the place.
A late conclusion to the race was interrupted by Charles Leclerc rear-ending Brendon Hartley under braking for the Nouvelle chicane with seven laps to go.
Hartley was running P11 with Leclerc just behind when the Sauber rookie smashed into the rear of the Toro Rosso shortly after exiting the tunnel.
Leclerc, who reported “no brakes” immediately afterwards, skated down the escape road with the front of his car deranged, while Hartley limped back to retire in the pits with a broken rear wing.
That triggered a virtual safety car, but with so little time remaining the frontrunners did not risk pitting and the order remained the same, albeit with Vettel falling further back from Ricciardo.
Fernando Alonso was the race’s other retiree. The Spaniard was on course to finish seventh until he was forced to retire his McLaren, which was smoking at the rear as he came to a halt on the exit of Ste Devote with 25 laps left.
So a masterclass performance from Daniel Ricciardo. Fastest in all the sessions and to take victory with a power issue is incredible. Well done honey badger on this Monaco Grand Prix triumph. That was redemption and payback.
Monaco Grand Prix, race results:
1 Daniel Ricciardo Red Bull-Renault 78 1h42m54.807s
2 Sebastian Vettel Ferrari 78 7.336s
3 Lewis Hamilton Mercedes 78 17.013s
4 Kimi Raikkonen Ferrari 78 18.127s
5 Valtteri Bottas Mercedes 78 18.822s
6 Esteban Ocon Force India-Mercedes 78 23.667s
7 Pierre Gasly Toro Rosso-Honda 78 24.331s
8 Nico Hulkenberg Renault 78 24.839s
9 Max Verstappen Red Bull-Renault 78 25.317s
10 Carlos Sainz Renault 78 1m09.013s
11 Marcus Ericsson Sauber-Ferrari 78 1m09.864s
12 Sergio Perez Force India-Mercedes 78 1m10.461s
13 Kevin Magnussen Haas-Ferrari 78 1m14.823s
14 Stoffel Vandoorne McLaren-Renault 77 1 Lap
15 Romain Grosjean Haas-Ferrari 77 1 Lap
16 Sergey Sirotkin Williams-Mercedes 77 1 Lap
17 Lance Stroll Williams-Mercedes 76 2 Laps
18 Charles Leclerc Sauber-Ferrari 70 Collision
19 Brendon Hartley Toro Rosso-Honda 70 Collision
– Fernando Alonso McLaren-Renault 52 Gearbox
1 Lewis Hamilton 110
2 Sebastian Vettel 96
3 Daniel Ricciardo 72
4 Valtteri Bottas 68
5 Kimi Raikkonen 60
6 Max Verstappen 35
7 Fernando Alonso 32
8 Nico Hulkenberg 26
9 Carlos Sainz 20
10 Kevin Magnussen 19
11 Pierre Gasly 18
12 Sergio Perez 17
13 Esteban Ocon 9
14 Charles Leclerc 9
15 Stoffel Vandoorne 8
16 Lance Stroll 4
17 Marcus Ericsson 2
18 Brendon Hartley 1
19 Romain Grosjean 0
20 Sergey Sirotkin 0
1 Mercedes 178
2 Ferrari 156
3 Red Bull-Renault 107
4 Renault 46
5 McLaren-Renault 40
6 Force India-Mercedes 26
7 Toro Rosso-Honda 19
8 Haas-Ferrari 19
9 Sauber-Ferrari 11
10 Williams-Mercedes 4