In that case, you have erroneus information here: http://www.cardhunter.com/leagues/ "Can I play the same player more than once in the league? Yes, you can, but the matchmaker will try to avoid this."
OK, I should have said "the matchmaker will try to stop you matching against the same player". It will get harder and harder to find a game as you play more.
Ok, thanks for the clarification! Can you reveal what the time limit is for a (first? if it's an increasing one?) repeat match? This way we would know whether to bother waiting any more when the league time limit is getting nearer and there are only repeat opponents left in the league lobby.