Altenberg has been the scene for some special moments for Loch – he claimed his first-ever World Cup victory there in 2009 and collected his third World Championship title on the track in February this year.
And the 23-year-old was at it again as he improved the track record in his first run to 53.395 seconds to take the victory, and allow the good times to continue to roll in Altenberg.
"I made one or two little mistakes in the first run," he said. "The second run was really very good.
"Well, the track in Altenberg seems to be made for me, no doubt about it. The conditions here are very good, my set-up was fine – so it was just up to me to take the victory."
Compatriot Andi Langenhan got the better of Lock in the last World Cup in Konigssee but the European champion had to do with second best in Altenberg, with Johannes Ludwig making it an all German podium in third.
Loch extended his overall World Cup lead and now sits on 258 points, 40 ahead of Langehan with Ludwig a further 20 back in third.
Meanwhile, in the team relay there was more for Loch to cheer as he helped Germany to a second-straight World Cup victory, alongside Anke Wischnewski, Tobias Wendl and Tobias Arlt.
This victory means Germany have won all 11 World Cup races this season, with Asutria and Russia finishing second and third respectively.