Mouz RN has 3 wins and plays FNC tomorrow.
FNC has 2 wins.
Astralis has 1 win and plays OG tomorrow.
OG has 1 win.
Navi has 2 wins and plays FaZe tomorrow.
FaZe has 0 wins.
If FNC beats Mouz, both teams will have 3 wins, the AST/OG match will result in one team with 2 wins and one with 1, Navi/FaZe will result in either 1 team having 3 wins and the other with 0, or one with 2 and the other with 1.
Then FaZe plays OG. Best case scenario for FaZe to give them even the slimmest of chances of making it at this point is - Mouz beats Fnatic, Astralis beats OG, and they beat NaVi. That will leave the table of W/L as
Mouz : 4-0
Fnatic : 2-2
Astralis : 2-2
OG : 1-3
NaVi : 2-2
FaZe : 1-3
Next day, games are (Mouz/Astralis), (FaZe/OG), and (Navi/Fnatic).
Let's say, hypothetically, FaZe wins. That leaves them 2-3 and OG 1-4. OG is OUT. No matter the result of the Navi/Fnatic game, one of the teams will be 3-2, meaning only one spot would be left for FaZe to try and advance. Assuming Astralis doesn't also win their game at that point, there will be a 3 way tie for the decider, all 3 teams being 2-3. At that point, I am not sure what would have to happen for FaZe to make Semis. (If Astralis does win, that means that the final stage is finalized with Mouz in the final and Fnatic/Navi against Astralis in the semi. At that point, FaZe is OUT, along with OG and loser of NaVi/Fnatic).
I would say this scenario is rather unlikely, but time will tell.