I don't have an answer for you. I've found Google Now can somehow forget to follow sports for you even when you have it set up correctly.
Just this baseball season, I had Oakland Athletics set in Google Now. For most of the summer (and while the team was on a roll!), I got all the notifications I needed. Then, as I searched for results of the other teams sneaking up on them, Google Now slowly fazed out showing my A's and I was left with a whole lot of Angels and even Dodgers and Giants. Then the Mariners began getting a card! All based on my searches.
Ultimately, I turned off Now, at which point it complains you'll loose all cards. When you turn it back on and set up your sports teams again, it seems they start showing up -- for a time. Just looked and not A's card for today's game...
Google needs to get on this.
TJH