No prestige classes, only Wizard. No rules concerning duel, so I'm assuming some arena or undefined space.

How about this... When I cast (mazimized) Time Stop - in the first round I'm dazed, since I cast Celerity. On the second round I cast Imbue Familiar with Spell ability. Third round I summon 1d3 of Fiendish Tyrannosauruses. Familiar casts say... Wall of stone around him. Fourth round I cast (maximized) Maw of Chaos, Familiar casts Fly. Fifth round I cast quickened true strike, move up, ready action to cast Mazimized Energy Drain when Time Stop ends, familiar does the same but with Enervation.

Time stop ends - he takes 120 dmg from maw of chaos, has to make a will save or be dazed, gets 8 negative lvls from me and possibly 1d4 from familiar and 1-3 Fiendish Tyrannosaurs charge him. How does that sound?