Someone correct me if I'm wrong, but I don't think that's possible at the moment. I suppose you could try creating the seeks in pairs or something along those lines. That way chances are you'd only end up with 2 games per opponent maximum.
Limiting Simultaneous Games / Opponent
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Is there a way to limit the amount of online games you can play simultaneously against the same opponent? My issue is that I tend to create around 5 open challenges at a time and I'm trying to avoid those opponents that seem to want to play all 5 of those games.