The 26.2-mile world record could fall at the Berlin Marathon on Sunday, live on NBCSN and NBC Sports Gold.
The NBC Sports Gold stream starts at 2:30 a.m. ET, with NBCSN coverage beginning at 3 a.m.
The time to beat is 2:02:57, the world record set by Kenyan Dennis Kimetto in 2014, also in Berlin.
Olympic champion Eliud Kipchoge is the headliner of three candidates to lower that mark.
He won Berlin in 2015 in 2:04:00 with his insoles infamously slipping out the back of his shoes and flopping the last half of the race.