Actually looking at it again we're both wrong

thegoddess has picked all four semi-finalists so is boxed in (a bit like the old arcade/mobile phone 'snake' game).
The only way you could do a perfect run would be to be very good at picking winners the round before they go out to somebody else.

Suprised myself with 10 in a row, think to do the perfect dozen you have to pick a few rags in the early rounds.

Catch you for the next tournament for my defence.