I looked at the schedules and I don't see them facing each other.
Vaz goes today, then the Expos play Phi tomorrow, off Thurs, then Fla on Fri, Sat, Sun. If they want Vaz to pitch every 5th day, he could face Fla on Sun. If not, they are off Monday and he'd face the Cubs on Tues the 9th.
Prior went yesterday. The Cubs have a double header today, then Stl on Wed and Thurs. Then Mil on Fri, Sat, Sun. If Prior pitches every 5th game, he would hit Mil on Fri, but more likely he will pitch on Sat. That would set him up to pitch the final game of the series against Montreal on Thurs the 11th, or the first game againt Cin on Fri the 12th.
I don't see the two of them going against each other unless I missed a make up game or another double header somewhere.
Yes doctor, I am sick.
Sick of those who are spineless.
Sick of those who feel self-entitled.
Sick of those who are hypocrites.
Yes doctor, an army is forming.
Yes doctor, there will be a war.
Yes doctor, there will be blood.....