There are several spots per map in tournament mode which you can get to before the map begins and spawn there when you should have been ported back to your starting zone.
These spots are anywhere on the map as long as its a wall and its sloping away from you but not climbable.
All you have to do is spam jump non stop up the wall at the correct angle (or dodge if you time it right) and if you are doing it correctly you will sort of "double jump" up the wall a bit,
If you are halfway through one of these double jumps as the match begins it will take you back to where you would have landed instead of your starter zone and tadah you can cap a point 10 seconds before anybody can even play.
there are severel spots behind the Keep in the first map and the Roof of the Clock Tower in the 3rd map ect, im sure there are many more