Maxim Vylegzhanin took silver, crossing the line 0.1 seconds ahead of compatriot Ilia Chernousov in third.
Legkov's margin of victory was the second narrowest ever in the Olympic 50km race. Defending champion Petter Northug won the event by 0.3 seconds at the last Games in Vancouver four years ago.
Russia had had a disappointing cross country competition until Sunday, winning just two silvers in team events.
- Sports & Recreation
- Ilia Chernousov
- Petter Northug
- Maxim Vylegzhanin