Prep time one day ( Time Travel Allowed).
Master has All of his tardises including his main one.
Doom has his main armour and main powers.
Round 1: Who would win in a battle of prep.
Round 2: Who is more smarter/intelligent
Round 3:Who would win in H2H
Round 4: Who is most likely to find the other first and kill the other
Round 5: Reed Richards and Doom vs The Master and The Doctor