it will be 3 (most matches played, most diference at win, most diference at defeats)
MIBR:
Most matches: 3 against LEVIATAN, VIKINGS
Most wins difference: 3-0 VIKINGS
Most defeats difference: 0-3 LEVIATAN
FURIA:
Most matches: 10 6-4 against G.BLUE
Most wins difference: 3-0 against INGAMING