This app was mentioned in 2 comments, with an average of 1.00 upvote
Use Sports Alerts. Their notifications are 100%. Also very clean layout, low memory usage, and doesn't require any ridiculous shit like access to your pictures or contact list.
https://play.google.com/store/apps/details?id=lunosoftware.sportsalerts&hl=en
MLB is great for watching or listening to the games, but it can be a bit buggy.
I like this one.