Mercedes motorsport director Toto Wolff has praised Lewis Hamilton's run to second place in the Spanish Grand Prix, describing it as a double 'P1' for Mercedes alongside race winner Nico Rosberg.

With Rosberg scoring his first win of the 2015 F1 season with a dominant lights-to-flag success, Hamilton toiled to a fairly distant second place finish after a poor start and a compromised pit-stop left him battling to pass Sebastian Vettel.

Unable to get through on track, Hamilton maximised an alternative three-stop strategy to leapfrog the German during his final stop and secure a second place finish. With this in mind, though Wolff was pleased to see Rosberg back to winning ways, he says Hamilton's second place also deserves plaudits.

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"The result feels like P1 and P1 because on a three-stop, with the compromised start, a compromised pit-stop, finishing P2 is really great driving from Lewis," he said. "For both of them were faultless in the race and that is extremely satisfying that we can pull it out when things aren't running perfectly."

Reflecting on the weekend as a whole, Wolff is uncertain as to why Rosberg established a comfortable advantage over Hamilton, but was impressed with the German's controlled performance.

"They are on such a level playing field," he said. "It is about feeling comfortable in the car, comfortable on the track... Lewis mentioned before the weekend that this wasn't his favourite track. I don't know if that is the reason. It was difficult to get it right set-up wise, with the gusty winds and the lack of grip, from session to session.

"Then going into the race, the minute you can control the pace from the front, it gives you a big advantage and that is what Nico did in a very controlled way."

Hamilton continues to lead the 2015 F1 standings by 20 points from Rosberg.