Share this: LAS VEGAS — International Fight Week kicks off Friday night at T-Mobile Arena with newcomer Justin Gaethje’s UFC debut against confident veteran Michael Johnson in the Ultimate Fighter Finale main event, and NESN.com will be on hand for all the action. Gaethje dominated the World Series of Fighting and is known as an aggressive fighter who inflicts “carnage,” as he told UFC.com. “I just really give people no time to rest,” said Gaethje, who’s 17-0 as a pro. “They want to rest, and I give them no time. My pressure is what people don’t understand until they fight me.” Johnson, the UFC’s fifth-ranked lightweight contender, presents quite a challenge for Gaethje. Johnson has been on big UFC cards throughout his seven-year career,