is not luck, the game is decided by blizzard algorithm; as soon as it make the lobby it decide who will win and what will be your final result based on your win rating, how much rating you gained/lost while not controlled by him and most important how much money you spent in the shop.
thats why you’ll see vevry often verey improbable results back to back for many games in a row
and all the people that is answering you with 1500+ comments are blizzard employers so dont bother read them