Charles Oliveira

Justin Gaethje says he -- NOT Conor McGregor -- deserves the next title shot against Charles Oliveira ... and he's gonna lose it if that doesn't happen. TMZ Sports talked to the 33-year-old #1 ranked UFC lightweight -- the guy who almost everyone believes will fight for the belt -- about…

Conor McGregor doesn't believe there's any doubt about who should fight UFC champ Charles Oliveira for the title next -- despite losing his last 2 -- 'cause it's obviously him! "So what date am I fighting Oliveira," McGregor tweeted Monday morning. McGregor's tweet comes just days after…