Only one of them will be in the masters,🤦 sad but true.
Hello Asuna_Yuuki! You see, unfortunately, the winner of Group A faces off the winner of the 2nd place round-robin. This leaves Group B and Group C's respective #1's to fight for a direct ticket to Masters Madrid. This format is pretty off-putting to say for the least.
Edit: I'm 90% sure that A faces off against 2nd place winners, and B faces off against C for one spot each. The comment above me is also a valid possibility, and I hope that's the case.