Third-ranked UFC lightweight contender  Justin Gaethje (26-5)  may have fought for the final time.   Former featherweight champion  Ilia Topuria (16-0) and former lightweight titleholder  Charles Oliveira (35-10, 1 NC) will fight for the vacant 155-pound title at UFC 317 on June 28 during the UFC’s annual International Fight Week.  Islam Makhachev (27-1) vacated the title to move up to the welterweight division in an effort to become a two-division titleholder.  According to his manager,  Ali Abdelaziz , Gaethje will ‘hang up the gloves’ if he isn’t booked to face the UFC 317 winner.  “Justin Gaethje fight the (UFC 317) winner. He’s won three of his last four. He saved the UFC two times. They needed him and he was there,” Abdelaziz told  Submission Radio . “The guy has done so much for the sport and if anyone says he doesn’t deserve it – He said, ‘If I’m not going to fight for the title then I’ll just hang up my gloves.’ “He’s a very principled guy,” Abdelaziz continued