The relationship between hard work and luck is described as DIRECTLY PROPORTIONAL. In mathematics if two quantities are directly proportional, it means if the first quantity goes up so the second quantity. Also if the first quantity goes down, so the second one. That is why, the harder you work the more lucky you become. You cannot talk about hard work and leave out luck, they are inseparable. They go with the same rhythm...
Basically, you create your luck by working hard for what you want.
"Luck is a point where hard work meets the OPPORTUNITY"
-Firoz Thairinil