phred952:
I usually allow about 5 to 7 seconds then click the cancel button . Usually it will stop it with just one post. Once in a while it will cancel the Tournament completely and you have to start over. Best work around available right now.
I recently had the opposite experience. I set up a tourney, then suddenly had doubts as to whether I'd made it single play and hit cancel. It returned me to the set up page, it turned out it was already single play and I hit create again.
And found the tournament was listed twice.
This is the only time I've had it happen to me, I have seen it before in the club though so yes, it would be very nice if the owner could delete duplicate tourneys.