The United States earned a walkoff victory against Australia behind Monica Abbott’s 13 strikeouts and Amanda Chidester’s game-winning hit. #NBCOlympics #Tokyo2020 #Softball » Subscribe to NBC Sports: https://www.youtube.com/nbcsports?sub_confirmation=1 » Watch live Olympic coverage on NBCOlympics.com: https://www.nbcolympics.com/schedule NBC Olympics is responsible…