By FOX Sports Staff
Although both drivers were pessimistic of converting their promising positions into a win at the Circuit de Catalunya, they were not expecting such a dramatic drop down the pecking order as they finished outside the top five.
Hamilton, in particular, had a poor race as he finished outside the points in 12th and struggled for much of the 66 laps after being overtaken ahead of the first corner by the likes of Sebastien Vettel and Fernando Alonso.
Even Rosberg had to struggle for his eight points as he faced stiff competition from Force India's Paul di Resta right until the final lap of the race, .
"It was an experience I don't want to go through again," Hamilton admitted after the race. "I don't know why it happened. I did absolutely everything I did in Bahrain but the tyres just didn't come in and give me any grip. If I pushed, they went off immediately.
"I'm absolutely lost, I don't know what went wrong.
"It seems like others have made a bigger step forwards than we did.
"If anything, it seems like we didn't make a step forward even though we brought upgrades because we didn't fix the problems of degradation."
Pole-setter Rosberg was at a loss for words as well as he said: "It's so strange, it's so inexplicable. I just don't understand it.
"The start was good and I managed my first stint well to keep some of the quicker cars behind me. From there, I had to drive my own race and we began to go backwards as it made no sense to destroy my tyres by trying to stay ahead.
"We didn't have the pace of the quickest cars today [Sunday] and there's a growing gap to three teams ahead of us which we need to get on top of.
"We have a very quick car but we have to make it work for us in the race.”
The Brackley-based outfit do not see themselves as frontrunners but they lost further ground in the constructors' championship as only one driver racked up any points. They now lie a massive 39 points behind Lotus who, for their part, saw Kimi Raikkonen impress with a second-place finish in the race.