Ofcourse but less than the luck that you need. When gambling in sports like tennis, you need to analyze and study both players and choose who will likely to win base on your analyze and with your luck
Working hard to analyze the two players might be worth it and can be seen after the match.
There's too many definition and meaning for the 'hard work' in gambling.
In too many definition has one definition is, We think that if we do work hard then we will get success, So in this sense, he is asking us about gambling hard work.
But in my thinking, gambling don't need hard working if we have Luck, it is not trading where we learn from our experience.
For instance, in dice here do we think we need hard working and in sports betting, i realize only analysis is enough to win in sport betting.