Fresh from his triumph on Sunday, Hamilton will split Mercedes' time with a familiar face, testing the Silver Arrow on the opening day on Tuesday before team mate Bottas takes over the W09 for the second segment of running.
"It has been a rejuvenating experience", he said. "It's the greatest feeling to have that kind of performance and a convincing win". But once the Safety Car pulled in at the end of lap six, Hamilton was in a race nearly on his own, a rapid first stint suggested that there was one man in contention for the win. I don't know what happened.
"We still need to add performance to the vehicle throughout the year, so that's what we're going to be continuing to be working on". Hamilton was serene but stressed victory had by no means been a simple task.
"In the end it was hard because I did almost 45 laps with the medium!" he said, adding that one-stopping had never been the team's original strategy.
"Apparently, the changes that were made did us more harm than it did our opponents", Ferrari's Vettel said.
Despite the upturn, concerns remain at Mercedes as to whether their auto is able to put its tyres in the correct temperature operating window.
U.S. will help China's ZTE 'get back into business'
He said that the Commerce Department, the U.S. authority which has imposed the seven-year ban, had been told to "get it done". Ordering a denial may have been the Commerce Department's idea of playing hardball to force compliance.
Despite their lack of pace in Spain, where not only were they not able to extract the same speed from their tyres as Mercedes but were also unable to coax them to last as long as the silver cars, the Italian team have had the most versatile auto so far this season.
Sign up to The Recap, our weekly email of editors' picks.
"Everything is going fine". "It's just very surreal to think that every now and then I keep coming up against Michael in terms of records". "Monaco, Hungary, Singapore. Part of why that is we know, but part is still a mystery.
As much as we are overwhelmed by the victory in Barcelona, my mind is already in Monaco and I remember Sunday night wasn't as pleasant past year". The guys have been working so hard back in the factory and here and it's so good to see.
Ferrari, with Sebastian Vettel leading the way, enjoyed a one-two in Monaco in 2017 and, while the Italians may not be feeling quite so confident after the last three races, should go well there again. He said: "If you're happy with your wife, you don't look at other women".
After fireworks in Baku with team-mate Daniel Ricciardo, a costly collision with Vettel in Shanghai, a string of early-season incidents and now clipping his own wing against Lance Stroll's Williams Martini Racing, questions still remain over Verstappen's exuberant style.