Answer
Eliud Kipchoge, a renowned long-distance runner from Kenya, holds the distinction of being considered one of Galen Rupp's primary rivals in the realm of long-distance running. While Galen Rupp, an American marathon runner, has achieved notable success on the global stage, Eliud Kipchoge stands out as an exceptional athlete, having secured world records and several marathon victories, cementing his position as a legendary figure in the world of long-distance running.