Remove specific pair before tournament starts

[criptik]

I recently created a tournament that was meant to be private but I forgot to check "Use Custom List".

I could edit the tournament to correct that but before I noticed the error, a pair not on our custom list had already registered.

Is there a way to remove that specific pair before the tournament starts? I tried sending them a chat message but got no answer.

I ended up cancelling the tournament and re-creating it but would be nice not to have to do this.