This seems odd and kind of unnecessary, but NJPW put Okada and Omega in the same block at the G1. Also in that block: Minoru Suzuki and Michael Elgin. Murderers row really. The other block is also not bad with Naito, Ibushi, Tanahashi and Ishii. Full list:
Bad Luck Fale
Zack Sabre Jr.
For those that don't know what the G1 Climax is: A tournament where each of the above blocks has matches in a round-robin style like a league. Wins give you points. The winner of each block then have a match in the final against each other. The Winner of the G1 is the top contender for the main belt and usually the opponent in the main event of WrestleKingdom, similar to how the Royal Rumble winner becomes the challenger at WrestleMania.
This year the tournament runs from July 17 to August 13.