Mercedes endured more frustration in Korea after failing to pick up any points for the second weekend in a row.
As was the case in Japan, Nico Rosberg fell foul of an incident on the opening lap and failed to finish, while Michael Schumacher lacked pace throughout and could only trail in 13th.
Rosberg's retirement came after he was collected by Kamui Kobayashi at turn three, and like Jenson Button
, the German was critical of his Sauber rival over the clash.
“Unfortunately this has been the second poor weekend in a row for me, and it's very frustrating to be taken out twice in the first corners of the race,” he said. “Kobayashi hit me from behind today and that was my race over.
“The one small positive to be taken from the weekend is our qualifying performance which was a small step forward. Now I'll look forward to India and hope for a bit more luck there.”
Schumacher meanwhile struggled for grip throughout and was unable to maintain his top ten starting slot as he failed to score for the third successive race.
“There are some races where nothing comes together and which you simply have to move on from straight away,” he said. “This was one of them. We didn't manage to get the tyres working properly over the race distance, which made for inconsistent lap times, and accounted for our step back in performance.
“We will write this one off, look forward and hope that we will be able to get back on the front foot again in the upcoming races.
Mercedes motorsport boss Norbert Haug meanwhile admittd it was important for the team to look into what had gone wrong at the Yeongam circuit.
“Nico was once again the victim of a crash on lap one when a competitor drove into his car,” he said. “This damaged the radiator which put an end to his race and, as in Japan, it was through no fault of his own.
“At no stage did Michael's car produce the grip we had anticipated. We need to quickly put this race behind us but not before a thorough analysis, with an understanding of why we got it wrong today.”