EMEA Group 5 TieBreaker

Hypothetical situation, but lets imagine M3C go 4-1 and top the group.
If NaVi beat FPX, AND M3C go 4-1, that means 3 teams (NaVi, FPX and Liquid) will all have 3-2 records and their H2H matchups will make a circle.
How is the tiebreaker now done? Round diff?
Because one of these teams wont make playoff in that case

let the 3 teams play matches against each other and the team which wins the most matches goes :D

Map diff between tied teams

Navi win:

Navi and FPX to playoffs, because Liquid has worse map diff than them in head-to-heads between Navi, FPX, TL

This assuming Gambit go 4-1