This is very subjective. The rule (law) of nature is that the best should win. Fair enough...survival of the fittest. Now if a player so much superior to his opponent, why should there even be a fourth or fifth set? The player would win in easy three sets. I wouldn't like to watch two players who don't play well, who make some silly shots play for over 5 hrs over 5 sets and see them paid well. That;s not how it works.