ALLENTOWN, Pa. (January 6, 2020) – WBC Featherweight World Champion Gary Russell Jr. will defend his 126-pound crown against unbeaten mandatory challenger Tugstsogt “King Tug” Nyambayar Saturday, February 8 live on SHOWTIME from PPL Center in Allentown, Pennsylvania headlining a Premier Boxing Champions event. The SHOWTIME CHAMPIONSHIP BOXING telecast begins at 9 p.m. ET/6 p.m. …