Akeno vs Grayfia(Battle of the Queens)
Rossweisse, Bova, Ouryuu, Elmenhilde, and Asia vs Crom Cruach(They are keeping him temporarily occupied as Rossweisse made a barrier that could possibly seal Crom Cruach's movements)
Xenovia and Irina vs Lint and Strada(Temporary)
Kiba and Koneko vs Ravel and Roygun(Temporary)
Issei vs Kiba(Kiba starts overwhelming him with his immense speed to the point so that Issei can't waste any more time is forced to go into DxD and defeat Kiba. After he defeats Kiba, he senses Crom Cruach's overwhelming aura. Crom released the aura and completely broke free of Rossweisse's barrier once he felt Issei's immense aura from going into DxD)
Ouryuu vs Gasper(Battle of the kouhai. Whoever wins gets to sit on Issei's lap every day next week.
)
Rias vs Roygun
Bova, Elmenhilde, and Asia(as healing support) vs Lint and Valerie(as healing support)
Xenovia, Irina, and Rossweisse(as support) vs Strada
Issei vs Gasper(he had some of Issei's blood which puts him in like a full awakening state that requires Issei to fight him in DxD)
Crom Cruach vs Ddraig(Ddraig wants to fight Crom Cruach because Crom Cruach is basically the only Dragon on his level besides Albion. So Ddraig would have an obvious boner to fight Crom. And Issei really isn't a battle maniac like Vali so he has no hard feelings over letting Ddraig fight Crom while he takes on Gasper)
Just my guess.