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.
Will it then change your chance to win ? if the game is base on skills like poker, maybe analyzing the nature of the player is also
important and giving added value to you can win, but for other games I don't think hardwork will work..