Mazdzer put together two phenomenal runs to climb from fourth to third in runs 3 and 4 to win the silver medal in men's singles luge - the first men's singles luge medal in US history.
Mazdzer finished 13th in two previous Winter Games, so this was quite a step up.
Gleirscher moved to the top of the standings with a composed final run but German Loch needed only to complete an error-free effort at the Olympic Sliding Center to be assured of his golden hat-trick.
Grand Canyon helicopter crash kills at least three
Teddy Fujimoto told CNN affiliate KSNV he was in the area taking photographs when he witnessed the aftermath of the crash. The Federal Aviation Administration and the National Transportation Safety Board will investigate, Kenitzer said.
As an 18-year-old, West had finished 22nd in the luge men's singles at the 2014 Olympics in Sochi, Russia. His wobbly final round opened the door for Austrian David Gleirscher, 23, to grab the gold in his Olympic debut. And when it comes to men's singles luge, Mazdzer will always be the first. Johannes Ludwig of Germany won bronze.
Once ranked No. 3 in the world as recently as the 2015-16 season, Mazdzer hadn't medaled since - until the Pyeonchang Games. Mazdzer, meanwhile, broke the course record set by Loch moments earlier to move into second.
Notes: Taylor Morris, the third American competing in men's singles, finished 18th overall with a cumulative time of 3:12.547.
PM Modi delivers keynote address in UAE
Modi then laid a wreath at the Yasser Arafat Museum in the city, in memory of "one of the world's greatest leaders", as he put it. Indian PM assured President Abbas that India stood by Palestine and that India was ready to support the country's just cause.
Gleirscher claimed the title with an aggregate time of three minutes 10.702 seconds, just 0.026 seconds ahead of runner-up American Chris Mazdzer, as snow fell in flurries at the mountainside track.
Long itself an underdog - if not an outright underachiever - USA Luge now has its first medal on the men's side, joining five previous medals won either in doubles competition or in women's singles.
Winter Olympics: Men's downhill pushed to Monday due to high winds
In a race that is purely man, or woman, versus mountain, downhill skiers tactfully dodge marked gates in the slope's fastest race. Waldner has already said that if the race can not be run it will be moved to Monday, weather permitting.