The press conference started late .
The fireworks took only minutes to get going when bitter UFC rivals Conor McGregor and Nate Diaz squared off today ahead of this Sunday 's eagerly - awaited grudge fight .
The press conference started late but the fireworks took only minutes to get going when bitter UFC rivals Conor McGregor and Nate Diaz squared off today ahead of this Sunday 's eagerly - awaited grudge fight .