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UFC 279 headliner Nate Diaz has unfinished business with Conor McGregor at some point after his fight with Khamzat Chimaev.      Related StoriesPaulo Costa rips 'scared' Khamzat Chimaev after altercation: 'The guy stood there and froze'Paulo Costa rips 'scared' Khamzat Chimaev after altercation: 'The guy stood there and froze' - EnclosureJake Shields says 'fake gangster' Khamzat Chimaev tried to start a fight with Paulo Costa at UFC PI