There is luck, but it favors a random person each time. Naturally, after multiple lucky 'incidents', some players will be favored more than others.
But each player's chances of getting lucky at a given moment are absolutely equal. If Player A had 10 lucky net cords so far and Player B had none, they both have an equal chance of 50% to get the next let cord.
Is that what you meant?
Duong compared Gasquet`s and Almagro`s seasons and saying that Almagro to his mind deserved it (Top-10 year-end) more, because as one of the reasons Gasquet was more "lucky". I don`t agree as a year, IMO, where players take part in many tournaments and play dozens matches is enough to nullify any "luck".
I like the first latso`s passage here, it`s all about run. I guess maybe during one tournament you can say that player was lucky/unlucky, but more...
For example, Murray lost 3 last matches from mps. Was he unlucky? Maybe after one I could agree, but 3 - looks to be not coincidence or randomness.
Though this topic isn`t about some very situation, bit luck overall in relatively long run and how everyone understands this word speaking about tennis.