The result is a breakthrough performance, improving on his previous personal best of tenth place achieved in World Cup competition earlier this season.
In run one Ferlazzo had the seventh fastest first run in 54.338 seconds, and in the second and final run finished in 54.440 which was the sixth fastest of all sliders.
His two-run time came to 1:48.805 seconds, placing him fifth fastest of all competitors, 0.992 seconds behind event winner Max Langenhan of Germany on 1:47.813, with Austrian Nico Gleirscher of Austria in second with Felix Loch, another German in third.
A thrilled Ferlazzo reflected on his PB and historic result.
"Fifth at Worlds, my best result by far!"
"The two weeks of training leading up to the race were horrendous to say the least. I honestly believe the support from family who made the journey over is what pulled me through."
"It’s incredible to see all the hard work paying off."
The luge athletes remain in Altenberg for a World Cup event next weekend.