Nico Rosberg finally secured Mercedes' first Formula 1 win of the season, as he maintained the lead throughout a Monaco Grand Prix interrupted by two safety cars and a red flag. Mercedes was unable to repeat its qualifying 1-2, as Lewis Hamilton fell to fourth behind the Red Bulls of Mark Webber and Sebastian Vettel.
Rosberg held his lead at the start and was able to maintain an advantage of around two seconds for the majority of the race, whether in tire conservation mode or showing his true pace.
Hamilton lost ground when the safety car came out amid the first scheduled pit stops.
Felipe Massa repeated his qualifying crash at Sainte Devote (LEFT), prompting the interruption and sending the Ferrari driver to the hospital for a precautionary checks-up.
As all those yet to pit immediately dived in to do so, Hamilton had to queue behind teammate Rosberg and emerged behind the two Red Bulls. Hamilton then spent the rest of the race mounting attack after attack on Webber for third, getting alongside through Rascasse at one point but never making it ahead.
Rosberg was not rattled by a mid-race stoppage, caused when contact between Max Chilton's Marussia and Pastor Maldonado's Williams sent the latter flying violently into the Tabac barriers. Maldonado was unhurt in the incident, for which the stewards punished Chilton with a drive-through penalty.
While Rosberg cruised to victory ahead of the Vettel-Webber-Hamilton train, which only spread out in the final moments, the rest of the pack engaged in some spectacular and wild racing.
Force India's Adrian Sutil pulled off brave passes on Jenson Button and Fernando Alonso into Loews. He then benefited when contact between Kimi Raikkonen and Sergio Perez at the chicane late on left the Lotus with a puncture and caused damage that would ultimately force Perez to retire.
Button came through to sixth, having earlier had another spat with his McLaren teammate Perez when the Mexican cut the chicane to hold him off. Perez was ordered to let Button past, but overtook him cleanly at the same spot later on. He then had another chicane incident with Alonso, and this time it was the Ferrari asked to move aside, having cut the corner. Raikkonen was next on Perez's list, but on that occasion the chicane move ended in contact.
Alonso lost out to Button in the traffic jam behind Perez's wounded car and finished a subdued seventh. Jean-Eric Vergne chased the Ferrari home in eighth.
Paul di Resta converted 17th on the grid to ninth place, thanks to pitting as early as lap nine and making his tires last to the end.
Raikkonen's recovery drive ultimately earned him a point, as he overtook Nico Hulkenberg's Sauber on the final lap.
The other major incident came when Romain Grosjean plowed into the back of Daniel Ricciardo at the chicane, causing the final safety car.
Jules Bianchi also crashed, slewing into the Sainte Devote barriers, having earlier sustained damage on debris from the Chilton/Maldonado crash.
PROVISIONAL RACE RESULTS
The Monaco Grand Prix
Monte Carlo, Monaco;
78 laps; 260.520km;
Pos Driver Team
1. Rosberg Mercedes
2. Vettel Red Bull-Renault
3. Webber Red Bull-Renault
4. Hamilton Mercedes
5. Sutil Force India-Mercedes
6. Button McLaren-Mercedes
7. Alonso Ferrari
8. Vergne Toro Rosso-Ferrari
9. Di Resta Force India-Mercedes
10. Raikkonen Lotus-Renault
11. Hulkenberg Sauber-Ferrari
12. Bottas Williams-Renault
13. Gutierrez Sauber-Ferrari
14. Chilton Marussia-Cosworth
15. van der Garde Caterham-Renault
DNF. Perez McLaren-Mercedes
DNF. Grosjean Lotus-Renault
DNF. Ricciardo Toro Rosso-Ferrari
DNF. Bianchi Marussia-Cosworth
DNF. Maldonado Williams-Renault
DNF. Massa Ferrari
DNF. Pic Caterham-Renault
World Championship standings, round 6:
1. Vettel 107 1. Red Bull-Renault 164
2. Raikkonen 86 2. Ferrari 123
3. Alonso 78 3. Lotus-Renault 112
4. Hamilton 62 4. Mercedes 109
5. Webber 57 5. Force India-Mercedes 44
6. Rosberg 47 6. McLaren-Mercedes 37
7. Massa 45 7. Toro Rosso-Ferrari 12
8. Di Resta 28 8. Sauber-Ferrari 5
9. Grosjean 26
10. Button 25
11. Sutil 16
12. Perez 12
13. Ricciardo 7
14. Hulkenberg 5
15. Vergne 5
All timing unofficial