It makes sense that Roger is seeded #1, and Rafa/Novak are in the other half, so if all top 4 seeds reach the semis, Roger would play #4. But what is the technical reason that it mattered for the French seed who won the previous semi-final head-to-head between Rafa and Novak 2 weeks ago? Why would Novak having won that match have put Rafa in the SAME half as Roger in France?