Lewis Hamilton wins his second successive race; Vettel only manages 4th place. The incident brought out the safety auto before the midpoint of the first lap.
The Finn, Mercedes team mate to four-times world champion Lewis Hamilton, would have been a victor in Azerbaijan last month but for suffering a puncture three laps from the end while leading.
The reigning world champion secured his second win of the 2018 season last weekend. He said "there's no point in trying to analyse any race or upgrade, it's simply about who is generating the right tyre temperatures at any given point". The season so far has been positive for us.
McLaren, Renault and Red Bull all bolted on major updates in Barcelona - indeed McLaren said this was essentially their proper 2018 race auto.
Mercedes have recently struggled on the street circuit in Monte Carlo and Hamilton predicts that Red Bull will provide strong competition in the principality. We had other priorities in the last few weeks.
"It was a very easy one-stop here and the tyres were very very similar but we have already spoken to Charlie [Whiting]", he said. More importantly, Mercedes-AMG locked out the front row.
Ferrari's strategic decisions are also under the microscope, though the strategy was largely influenced by tyre issues.
Mercedes driver Lewis Hamilton won an incident-packed race, with only 14 of the 20 drivers making it past the chequered flag. Exiting the pits, Vettel re-entered the race running seventh. That dropped him back to 4th place, behind Max Verstappen. The resulting collision left Hulkenburg with a shattered rear suspension while Gasley ended up with a snapped front suspension. Daniel Ricciardo, who also had a relatively quiet race, rounded up the top five.
On Sunday, the German admitted: "No excuses - they were faster than us and beat us fair and square this time, but we can bounce back".
Hamilton's win on Sunday was the 21st time in 28 races the polesitter has won at the Circuit de Catalunya.
"For me it's not about setting records everywhere", he added.
"As with Valtteri, a one stop became the best strategy to defend the lead from there and managing the tyres and the pace was the goal from there to the finish". They changed, but they changed for everyone. His team-mate Kevin Magnussen has 19.
Romain Grosjean was lucky to get just a three-place grid drop in Monaco for his insane full throttle tyre-shredding spin in the third corner of the race. No team could touch their times during the session. Nonetheless, Alonso showed he's still got it by passing Esteban Ocon around the outside of Turn 3 on lap 7.
Giovinazzi will be joined in the Sauber C37 by Charles Leclerc, while Haas' Romain Grosjean will be the first out for the American team - they are yet to confirm their Wednesday driver.