As opposed to his win here in 2017 and 2018 from pole position, Hamilton had to overtake pole-sitter Bottas.
Hamilton reclaimed the lead of the F1 championship in Barcelona, beating teammate Valtteri Bottas into Turn 1 and controlling the race from that point on.
Mercedes have now set an F1 record by chalking up one-two finishes in the first five races of a season - Bottas and Hamilton celebrated on the podium by lifting Mercedes supremo Dieter Zetsche onto their shoulders.
Ferrari's Mattia Binotto remains hopeful.
Senna, who had received Prost's blessing, won three titles in in his first four years with the team in what proved to be a hugely successful McLaren career.
"Mercedes have taken us to a much-better place in a dark time".
"That puts another spanner in the works and often when the cars are close, there's strengths and weaknesses of either team and how you play those and benefit from those, it's awesome".
Mark Webber told Wide World of Sports recently that Verstappen had matured significantly in 2019, and that's been reflected in his results, consistently getting the best out of a vehicle that simply doesn't have the pace of Mercedes.
"The team have spoken a bit and Valtteri and I have spoken a bit, I think we have the best pairing on the grid in terms of the respect we have".
"Everyone is still pushing incredibly hard, which is still so great to see".
"There are not many CEOs that have empowered a group of people like you did", the Austrian said in his presence post-race. In the engineers' room, nobody is over confident. They don't mind constructive criticism. As pressure builds within Ferrari, he will increasingly be forced to take such risks - and sometimes they might even pay off...
Team boss Toto Wolff understands why fans are concerned by Mercedes' start to the year but says his only focus is on maximizing results whenever possible.
"If, one day, our ways part, it will be very positive and each of us will try to achieve success with a different set-up so no drama".
"Harry, you don't know how much this message means to me buddy", he wrote. This team coming together with the struggles that we had in the winter is just a super satisfaction for the team and the group and this is what my personal feeling is.
His dad, James Shaw, told The Mirror: "I can not describe how much it means to us all that Lewis won the race for Harry, and then dedicated it to Harry, too". "Honestly, I wasn't thinking about the last race".
"We've had a number of developments on the chassis and power unit side which we can hopefully bring to the race auto over the next few races", chief engineer Andrew Shovlin said.