The 28-year-old double Olympic champion, who has won all six of this season's two-man events, remains the series leader in both disciplines after edging out countryman Johannes Lochner’s sled in St. Moritz.
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Friedrich and his crew of Candy Bauer, Martin Grothkopp and Alexander Schueller put together runs of 1:05.46 and 1:05.02 to tot up an overall time of 2:10.48 - enough to take gold by just 0.51 seconds.
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Fellow German Lochner (2:10.99), who was followed in the St. Moritz standings by Latvia's Oskars Kibermanis (2:11.01), remains Friedrich's nearest challenger in the four-man title-hunt.
Friedrich is chasing a first-ever four-man World Cup crown after second-placed finishes in both 2015-16 and 2017-18, while in the two-man, he is looking to regain the title he won in 2016-17.
This year's World Cup circuit resumes in Lake Placid, in the United States, on February 15-16.
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