Justin Gaethje 's a big underdog against Ilia Topuria at The White House ... so, what does the MMA star have to do to pull off the big upset?? Team USA hockey legend Mike Eruzione is sharing a few words of wisdom. It all started when TMZ Sports talked to 37-year-old Gaethje last week, and he told us he was gunning to bring "Miracle on Ice" energy to his Freedom 250 fight against Topuria, who is a substantial betting favorite. As UFC fans will know ... Justin's from 'Merica, while Ilia lives and