The reigning World Champion got home in one minute 58.44 seconds, beating the Kroeckel by 0.48 seconds to extend his lead at the top of the standings.
Latvian Dukurs has now won the last three World Cup races, and was the only man to break the 59-second mark in his first run – 58.96.
Kroeckel finished just above compatriot Frank Rommell, who claimed third place with a time of 1:59.36.
Dukurs' older brother Tomass, who won the European Championship silver at the same venue last year, finished with a time of 1:59.74 to continue his charge up the rankings.
Brit Kristian Bromley, two-time World Cup winner and the 2008 World Champion, finished a respectable sixth after his two runs amounted to 2:00.67.
The 30-year-old – who became the first man in history to win the World Championship, European Championship and World Cup in the same season in 2008 – slid home in 59.96 on his first run but a time of 1:00.71 saw his chances of breaking into the top three diminish.