Pflieger raced the Berlin subway for 10 kilometers (6.2 miles) - and won.
Pflieger's epic race was a long-distance variation on the internet phenonenom called Race the Tube, in which participants race a city's metro system for one stop.
He streamed the 32-minute race live to Facebook and later posted a highlight clip online.
Pflieger raced the U6 and U2 lines from Naturkundemuseum station, in Berlin's inner north, to Neu-Westend station near the 1936 Summer Olympic stadium in the west.
He narrowly beat the train, which would have made 19 stops, according to Google Maps.
The 29-year-old athlete competed in the men's marathon at the 2016 Rio Olympics, coming in 55th place with a time of 2:18:56.
The trend first gained popularity in 2014, when a British runner raced the London tube from Mansion House to Cannon Street.
It has enjoyed something of a resurgence in recent weeks with the increasing popularity of Facebook live.(DW)