ARRGHH! I had 3 units on AZ -125 at SIA, decided to middle 3 more with AZ -125 / NYY +140 (WSEX). Got the NYY side down but as I was clicking on the confirm at SIA the event "went off" (love that, the game won't start for 15 minutes at least). So now I have a whopping 0.2 units to win 0.8 units on AZ.
Of course maybe that's a good thing...