Hamilton had led from pole and in the clean air out front was able to extend his advantage over Vettel who had made it past Bottas into second through the first corner.
"I needed this pole, I haven't had a pole for a while".
Lewis Hamilton took six of the nine victories in Europe past year to take a stranglehold on the championship, but although he is pleased with the result in Spain, Wolff said he is not getting overexcited just yet.
"To have the performance I've had, I am very happy with that".
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"But it took everything from us to get this result, and to get a one-two in qualifying is fantastic". "Ferrari were sandbagging until this afternoon and Valtteri has been driving exceptionally well. To get a one-two in qualifying is fantastic for the team". "Maybe there was a tiny bit but not enough to get to the first row".
But it's a reflection of how disappointed he's been with his form over the first four races of 2018 that today's outcome was such a relief for the four-time world champion. Therefore we were not able to stay out for another 25 laps. He foresaw an "interesting race" on Sunday.
"It was so close today like it's been all weekend", said Bottas. "Anything can happen really, just like the last couple of races". We had a read what the track was like. The next race on the calendar is the Monaco Grand Prix on 27 May.
"This is when we are going to start applying some pressure", said Hamilton, who has gained 34 points on Vettel in the last three races.
He had won in Bahrain and in the season-opener in Australia, when he wasn't as dominant as Hamilton but took advantage of a safety auto to win on race strategy.
Unusually for Barcelona, it was a race of attrition with six retirements.
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"I chipped away at my lap time by a few hundredths but it wasn't enough", Ricciardo said. It was clear, then, that they were the team and driver to beat. "The more comfortable I am, the more the pace shows". Low grip caused problems all around, but for none more than Haas' Romain Grosjean. The speed is there and the driveability is much better than Mercedes' auto.
Both Spanish drivers made it to the final qualifying session, with two-time champion Fernando Alonso eighth with McLaren and Carlos Sainz ninth with Renault.
"They appear to be a lot harder than past year", he said. "So that's a positive thing". The Finn driver had a new engine after Friday practice and complained of losing power. He clipped the grass on the entry of a turn and spun into the tire barrier, significantly damaging the vehicle.
A hard weekend for Williams, who were well off the pace, was compounded when Lance Stroll crashed in Q3, going wide on the exit of turn 12.
Race organizers said additional security was implemented after several cars were broken into at a closed parking lot for the media at the track.
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