Hartley bounced back from his horror crash at practice to battle his way through from the back of the field in the Sunday race (NZT Monday).
Results from the Spanish Grand Prix are below.
"It's nearly all sorted", Mercedes boss Toto Wolff confirmed in the wake of Hamilton's victory in the Spanish GP.
Hamilton put in a dominant performance, winning easily and showing Ferrari that Mercedes remains the team to beat in Formula One despite Ferrari dominating most of the early season.
Valterri Bottas found himself on the second step of the podium, making it a Mercedes 1-2, with Max Verstappen bouncing back strongly from his Baku DNF in 3rd place.
The world champion had struggled for competitiveness in the previous three races, despite a win in Azerbaijan. "This weekend, definitely we got ourselves onto the right path and I think the team just did an exceptional job, managing all aspects and improving in all areas". "It's a good feeling". This win was his 64th career victory and third in this circuit. Restarting on lap 41 it was Hamilton out front followed by Bottas and Verstappen with Vettel and Ricciardo running fourth and fifth. "(I was) struggling to keep these tyres warm. "It's hard to beat all of these records that he has".
Ferrari, having entered the race four points clear of Mercedes in the Constructors' Championship, now trails its opponent by 27 points.
"I mean, we are drivers, not to say that we know everything - we don't know anything about engineering the vehicle - but we know how the cars feel, how to drive the cars and their limitations to overtake", added the German.
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Sergio Perez finished ninth for Force India, while Alfa Romeo Sauber's Charles Leclerc scored points for the second consecutive race, finishing tenth. But it's unclear what impact the upgrades have had on the competitive order, beyond Ferrari seeming to fall behind Mercedes in qualifying pace and also fall behind Merc and Red Bull on race pace.
Vettel was the first of the leaders to stop for fresh tyres, but was the only one who needed to stop again, which cost him two places. We have had other priorities in the last few weeks.
"For us it was not an option to stay out, " Vettel said.
Vettel appeared set to finish second until Ferrari's gamble to pit him for a second time backfired, Valtteri Bottas instead following Hamilton home for Mercedes' first one-two of the year. Ricciardo cut under the 1:19 mark on lap 61, but it meant little to the Australian, in a lonely P5. But racing was immediately interrupted by the safety auto when Nico Hülkenberg and Pierre Gasly were collected by Romain Grosjean in the Haas who went off and spun back across the track through the third corner.
Lewis Hamilton was back to his imperious best in Barcelona, obliterating the field with a decisive set of fastest laps after the first safety auto.
Sebastian Vettel had jumped Bottas to seize second place on the first lap and survived a strategic skirmish with the Finn before lap 20 to hold onto the position, but a tactical blunder by Ferrari under virtual safety auto conditions at half distance cost the German his podium place.
"But then of course there's always a part of me not happy being second because I want to win races - but it's still a long year ahead and, I'm a racer but I'm also a team player".
"We couldn't make the tires last", said Vettel.