well RM looks like the last team in the Copa semis.
My preference for Copa Semis:
1. Betis. The "weakest" team in the draw on paper imo. Despite the defeat at home vs Betis, I feel most confident against them and I think this tie could give opportunity for rest. This will also leave RM and Valencia with 2 difficult matches.
2. RM: At least both team will have difficult games. The 2nd leg of the Copa will take place just 3 days before another clasico in La Liga so not much rest for both team
3. Valencia: A difficult tie and EV will most likely play his best team vs Valencia.