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.
Hard work will pay off if you are also smart, hard work alone will not give you success in gambling.
We are spending time and effort on analyzing games but it has to be games that has no house edge, otherwise there's no success that we will achieve.