Alexander Zubkov and Alexey Voevoda of Russia led the two-man bobsleigh event at the 2014 Olympics after the first day of competition at the Sanki Sliding Centre.
Zubkov and Voevoda clocked a combined time of 1min 52.82sec after two runs to finish 0.32sec ahead of the second-placed Swiss team, Beat Hefti and Alex Baumann.
On his first run, Zubkov, the 2011 world champion and Vancouver Olympics bronze medallist, set a new track record with a time of 56.25sec.
Hefti and Baumann, who were fourth after the first run, managed to improve their position in the second to take the second place 0.04sec ahead of Americans Steven Holcomb and Steven Langton.
This season's World Cup winner Holcomb, who also won the 2010 gold medal in the four-man event, was just 0.09sec behind Zubkov after the first attempt but finished third with a time of 1:53.18.