After a duel ends prompt a window saying if you want to use same deck or not and reenter. When you are farming for example the Imperial, or even more crucial limited time of GC NPCs, it is so annoying to have to do many clicks to re-duel.

As is now is: get prize > re-duel > select deck (from 1 to 4 with gamepad) > start [3-7 Clicks!]

If you add something like: Duel is over. Do you wish to reuse same deck? (Yes or No or End button on window)
If is Yes the next duel would start, if is No would go to to deck selection, if was End would close everything and stop interaction with NPC.

This could make duels going faster with just one click instead 3-7.

I am used to duel from yu-gi-oh but can be called match or whatever you see fit. Same for the message as long lead to this is a good improvement.