Tugstsogt Nyambayar
Tugstsogt Nyambayar is a Mongolian professional boxer. He held the IBO featherweight in 2019 and challenged for the WBC featherweight title in February. As an amateur, he won silver medals at the 2009 World Championships and 2012 London Olympics. As of June 2020, he is ranked as the world's seventh best active featherweight by The Ring and the Transnational Boxing Rankings Board.
Amateur career
As a seventeen-year-old amateur, he won the silver medal at the 2009 World Amateur Boxing Championships. At the age of twenty, he 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.Professional career
In 2015, he signed with the manager/adviser Al Haymon and made his professional boxing debut in March of that year. He is trained by John Pullman at Pullmans Boxing Gym in Northridge, California.Professional boxing record
| No. | Result | Record | Opponent | Type | Round, time | Date | Location | Notes |
| 13 |  Eduardo Ramirez | – | 19 Sep 2020 |  Mohegan Sun Casino, Uncasville, Connecticut, U.S..png" /> | ||||
| 12 | Loss | 11–1 |  Gary Russell Jr. | UD | 12 | 8 Feb 2020 |  PPL Center, Allentown, Pennsylvania, US.png" /> | For WBC featherweight title |
| 11 | Win | 11–0 |  Claudio Marrero | UD | 12 | 26 Jan 2019 |  Barclays Center, New York City, New York, US | Won vacant IBO featherweight title |
| 10 | Win | 10–0 |  Óscar Escandón | TKO | 3, 1:18 | 26 May 2018 | Beau Rivage Resort and Casino, Biloxi, Mississippi, US | |
| 9 | Win | 9–0 |  Harmonito Dela Torre | UD | 8 | 18 Nov 2017 | Cosmopolitan of Las Vegas, Las Vegas, Nevada, US | |
| 8 | Win | 8–0 | Jhon Gemino | TKO | 10, 1:05 | 25 Feb 2017 | Legacy Arena, Birmingham, Alabama, US | |
| 7 | Win | 7–0 | German Meraz | RTD | 5, 3:00 | 8 Dec 2016 | Orange County Fairgrounds, Costa Mesa, California, US | |
| 6 | Win | 6–0 |  Rafael Vazquez | TKO | 1, 1:24 | 15 Jul 2016 | Horseshoe Casino, Tunica, Mississippi, US | |
| 5 | Win | 5–0 | Juan Ruiz | RTD | 4, 3:00 | 5 May 2016 | Irvine, California, US | |
| 4 | Win | 4–0 | Pedro Melo | KO | 2, 1:44 | 3 Dec 2015 | The Hangar, Costa Mesa, California, US | |
| 3 | Win | 3–0 | Arturo Badillo | RTD | 3, 3:00 | 27 Aug 2015 | The Hangar, Costa Mesa, California, US | |
| 2 | Win | 2–0 | Manuel Rubalcava | KO | 1, 1:38 | 18 Apr 2015 | StubHub Center, Carson, California, US | |
| 1 | Win | 1–0 | Gabriel Braxton | KO | 1, 2:10 | 13 Mar 2015 | Citizens Business Bank Arena, Ontario, California, US |