He ended a 54-year drought for Team USA.
Halfway through the four-round event, Mazdzer was in fourth place, with a total time of 1:35.517 - just one one-thousandth of a second behind Roman Repilov, Olympic Athlete from Russian Federation, but it would have been enough to keep him off the medal stand.
Austria's David Gleirsche took home the gold, while Germany's Johannes Ludwig earned bronze.
Mazdzer then unleashed a third-round run of 47.534, the finest time of the entire competition to date, that vaulted him into second place, just behind Felix Loch's 2:22.259. He hasn't made a podium since and his best finish during the most recent World Cup season was sixth. "I never made a podium at a World Cup and now here I am at the top of the podium".
The 29-year-old athlete won the silver medal for his excellent placement in the event earlier in the day on Sunday (February 11) in PyeongChang, South Korea.
On a bone-chilling night at the Olympic Sliding Centre, Loch was smiling after he grabbed the track record in his third run as snow fell in heavy flurries at the venue.
With a final time of 3:10.728, Mazdzer won silver thanks to a strong closing run over the last two rounds.
Mazdzer's camp, consisting of parents, two sisters, his girlfriend and two buddies, duly went ballistic at the finish-line terrace.
He was all set to create history ahead of his final run, as his medal rivals promised little.
"One very bad run but that's sport", said Loch, who was consoled by IOC President and luge fan Thomas Bach at the venue.
"It's 16 years in the making", Mazdzer, a three-time Olympian, told NBC afterward. Gleirscher was faster, but Mazdzer finished in that coveted medal position.
"It's just magic. I can't describe this, it's just unbelievable".