With a faultless and unchallenged 64th victory, the British driver extended his championship lead over Ferrari's Sebastian Vettel to 17 points and, more importantly, the Mercedes cars appear to have a comfortable pace advantage again.
The Finn retired, managing to drive slowly back to the pit lane.
After three races in which driver and the team have struggled to unlock performance from tyres and vehicle, Mercedes finally had the platform required at the Circuit de Catalunya.
"It's obviously a little bit early to say but I would like to hope that it could be part of a turning point", he said. Mercedes and Hamilton's return to form means the reigning champions are "back in business" for 2018, says Sky Sports, but can they they win in Monaco?
"It's the greatest feeling to come here and have that kind of performance and have a convincing win".
Pressure had been building on the Silver Arrows following a tricky start to the season - a miscalculation by the team cost Hamilton dear in Australia and he had to settle for third and fourth-place finishes in Bahrain and China respectively. Ferrari had a race to forget as Vettel could only manage fourth following a late-race call to the pits.
But after logging 136 laps in post-race at Barcelona testing on Tuesday, during which he trialled both the standard and the thinner-tread tyres, Vettel conceded Ferrari would have struggled even more without the change. 'The bottom line is that we were not quick enough, ' a rather glum Vettel conceded.
Coming off four straight titles in both the constructors' and drivers' championships, Mercedes had started the season by showing good pace in Australia, although it let victory escape thanks in part to an ill-timed safety auto that helped Ferrari's Sebastian Vettel earn the win in Melbourne.
As Bottas rejoined, Vettel was at full speed and even took the chance to overtake Magnussen before Turn One. He was alone out front after making some smart calls with the little excitement the virtual safety vehicle was able to provide. They are Lewis, Valtteri and the Mercedes young drivers.
Red Bull's Daniel Ricciardo said that he knows his team was involved in the recent discussions about the new aerodynamic changes, but he was left mostly in the dark. But the Frenchman's stock in F1 has never been lower after he sparked a massive three-way crash on the opening lap on Sunday. Grosjean was branded a "first-lap nutcase" by Mark Webber back in 2012, and was also banned for one race that year after he caused a huge shunt in Belgium.
Todt however insists every driver had an opportunity to voice their opinion, and that his door is always open to whoever feels the need to discuss a specific matter. He has zero points in 2018. If not off to Ferrari in 2019, Haas might be eager to have the young star in their vehicle instead of an underperforming Grosjean.
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