Coello and Tapia are playing their first tournament together and have yet to drop a set, despite playing two tie-breaks in earlier rounds.
The fairy-tale week for Rubio and Ruiz ended on Saturday at the Bab Al Nojoum resort, but the Spaniards can look back on a very successful week, knocking out four-seed Paquito Navarro and Juan Tello.
As for second-seeded Tapia and Coello, they could become the youngest male couple to win a tournament with victory on Sunday at a combined age of 43.
Watch the match highlights below!