After that, Nyambayar won the silver medal at the 2012 London Olympics, losing to the Cuban boxer Robeisy Ramírez by a score of 14:17 in the final.

Escandón was knocked down five times by the midway point of the third round, which forced referee Keith Hughes to wave the fight off.

[8] On 23 October 2019, the reigning WBC featherweight champion Gary Russell Jr. was ordered to make a mandatory title defense against Nyambayar.

[9] The fight was booked as the event headliner of a February 8, 2020, Showtime card that took place at the PPL Center in Allentown, Pennsylvania.

[13] Instead of waiting for another WBC title shot at featherweight, Nyambayar opted to move up to super-featherweight in order to challenge the WBA interim champion Chris Colbert.

Colbert utilized his height and reach advantage to great effect, keeping Nyambayar at bay with the jab for the majority of the fight.