Well I guess I'll be the heir for concern.
Make up some rules; or else somebody will end up going "WTF" after something happens lol.
Also; might I suggest a BO3 (Best Of 3) ?? Again; because you never know what will happen =)
(Although it will be a little lame with statloss; but if the loser of the first fight doesn't wanna wait 20 mins for stat, then that can be it)
Again; just suggestion. I have been on the up & down side of 1v1s/team fights of something going weird and when the winning party is like "HELL NO I WON!" it's a bit lame.