In sports betting, is there even a thing like luck? I stand to be corrected, but I feel that you will only be more lucky when you are more experienced;
when you have more knowledge of the teams in the match;
when you know the availability of players;
When you know the whether conditions;
When you know their head to head;
When you remove greed;
Someone who doesn't apply the above precautions might continue losing while anyone who applies the above precautions will have high chances of winning. So, I don't see luck factor here. Maybe it exists in rare cases.
I always think that in live sports, there could always be luck involved. Some matches seem hopeless until something unexpected happen which in that case you can consider yourself lucky if it goes your way. Maybe an athlete you are against gets a penalty or gets a serve, a kick, or whatever it is he is supposed to be doing wrong and suddenly the game seems like it would be going your way then you can call yourself lucky.
Though of course you can't depend on luck all the time. For better chances of winning you really should go and learn more about the match but in rare cases that you seem to be losing but the game turns around then you can thank your luck.