Here are the possible scenarios that might happen in the quarterfinals of the 2019 PBA Commissioner's Cup between the three sister teams namely, San Miguel Beermen, Barangay Ginebra San Miguel, and the Magnolia Hotshots Pambansang Manok. See scenarios below.

SCENARIO (Ginebra vs SMB)

IF Ginebra wins against Columbian, Blackwater wins over Alaska, Magnolia loses over TNT, and San Miguel wins its final two games. This is what will happen:

3 Blackwater 7-4
4 Ginebra 7-4
5 San Miguel 6-5
6 Rain or Shine/Magnolia/Phoenix 5-6

Therefore, it will be Ginebra vs SMB in the quarterfinals!

SCENARIO (Ginebra vs Magnolia - Manila Clasico)

So how can a Manila Clasico quarterfinals happen? First, Magnolia has to hurdle TNT in its final game. A victory by Blackwater, a win by Ginebra, and two San Miguel victories will set the stage for a Magnolia-Ginebra quarters.

3 Blackwater 7-4 (Elite take third seed after beating Ginebra in the eliminations)
4 Ginebra 7-4
5 Magnolia 6-5 (Hotshots take fifth seed after beating San Miguel in the eliminations)
6 San Miguel 6-5

Even a loss by Ginebra will lead to a Final Eight playoff between the two rivals.

3 Blackwater 7-4
4 Ginebra 6-5 (+24 point differential)
5 Magnolia 6-5 (+15)
6 San Miguel 6-5 (-39)

Ginebra has the superior point differential and quotient among the three sister teams after a 21-point victory over Magnolia and a three-point win over San Miguel. Magnolia will be the fifth seed by virtue of a 36-point win over San Miguel, notwithstanding a 21-point defeat to Ginebra. San Miguel will fall to sixth because of its defeats against Magnolia and Ginebra.