Mazdzer slipped to seventh in the fourth run but was still able to stay in second place overall and win the silver medal behind Austrian David Gleirscher, who overtook Loch and Mazdzer on the final run.
The light in the cave is now blinding for Mazdzer who will be able to continue his 16-year love affair with luge, for all its frustrations. "I've had a rough last two years, and it just shows: Don't ever give up".
Loch set the tone with the first run of the day with a course record (that record was broken by Mazder moments later). Whenever you lose, keep fighting. In both 2010 and 2014, he finished 13th.
Gleirscher's cumulative time over four runs (Runs 1 and 2 took place on Saturday, with Runs 3 and 4 on Sunday) was 3:10.702, as he won by 0.026 over Mazdzer.
Mazdzer took advantage of Russian Roman Repilov faltering in Run 3 to move into second place, and maintained the momentum in the last run.
On the fourth and final run, Loch did what he had never done before in the Olympic Games - he had a disastrous run. "I'm an outsider. I like being the underdog".
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Then, when he needed it most, Mazdzer delivered in his fourth run.
Chris Mazdzer of United States smiles in the finish area after his second run in the men's luge at the 2018 Winter Olympics in Pyeongchang, South Korea, Saturday, Feb. 10, 2018.
Mazdzer, who describes himself as a goofball who knows how to flip the switch to serious when he needs, beamed after crossing the finish line.
Mazdzer's US teammates didn't fare quite as well.
Austria's David Gleirscher struggled to make the Olympic team, but is now the men's luge gold medalist. Mazdzer's medal was the Team USA's sixth all time in the luge, which was introduced to the Winter Games in 1964.
(L-R) Chris Mazdzer, David Gleirscher and Johannes Ludwig celebrate after watching the final run of Felix Loch in the luge men's singles at the Olympic Winter Games PyeongChang on February 11, 2018 in PyeongChang, South Korea.