I've already experienced this in Round 6.It's seems that the Captains "cross-reference-sheet-system" isn't working so well 
Oh dear. What can I say? That's the second week running I've cocked up. I'm very sorry.
Tellus, if the Admiral beats you a second time, I will compensate you by excluding you from the top end of the draw for round 9... Which
should mean you get an easier match next time round...
I feel I should explain the process so you can see how this goes wrong...
I'm not making excuses, but I have to say the whole thing is fabulously labour intensive, and involves copying words and figures to and fro between Excel spreadsheets and Word documents. There might be a cunning scientific way to do this, but I haven't found out what it is yet. I do it by hand and eye...
Here's the current plot of who has played who...

As you can see, for some reason I didn't carry across the round 6 match between Tellus and Admiral Benbow from the Word document (where I had scheduled the matches following the draw) to the Excel spreadsheet. So then I am trying to rejig the round 8 matches where repeat matches have occurred - and I see no little coloured box between Tellus and The Admiral. I think I'm safe to pit them against each other. Hey presto!
Human error - my mistake.
But honestly, you should try it some time...

It's made a lot more difficult because:
1. As the competition goes on, more and more draws are resulting in matches which I have to change, because they've met before. And as soon as you move one match, that has a knock-on effect somewhere else. And so on.
2. I am trying to make sure that the top 16 fight each other and the bottom 30. But who is in the top 16 and bottom 30 keeps changing of course! Doing the draw and then rescheduling matches as fairly as possible within these two smaller pools makes it doubly difficult.
I'm not complaining... Just explaining.

Still - only 2 more rounds to go. Phew...