Both casino games and sports betting are similar in many ways though you can gain an edge over the house in sports betting if you are a pro punter while the same cannot be done in casino games. It mostly comes down to luck though as some of the posters above mentioned.
Along with the above mentioned points you need to know what your lucky number is. And which day is best to play.
I think most gambler would not gamble when they had a rough start of the day.
I have no idea why you believe in such things. There is no such thing as a lucky number, day etc since everything is random.