Luck

Is there such a thing as luck? I can go either way answering this. While I do not think that the concept of luck exists, some people just seem luckier than others. I can use the casino as an example. I am not a gambler. If I lose ten dollars I will be upset. On the two occasions that I have gone to a casino I have lost. I go with a few dollars and lose it within five minutes. I have a friend that recently won $25,000. He won that on the first pull of the machine.Yesterday, he went to the same casino. He tried two times and on the second try, he won $2,500. Is that luck?