Roger Federer won his 15th grandsslam title to become the all time leader in grand slam victories. A tremendous achievement. I find it interesting that Federer's total is rather similar to Nicklaus' total victories in Major golf tournaments. The games are so different. The nature of scoring in tennis, win a game by 2 points , win a set by 2 games, acts as a means of making sure the more dominant player wins. In any given period the top tennis player in the world rarely loses because the game is designed to specifically discover the better player.
Golf on the other hand has such a tight dispersion of scores with each stroke counted that even a small number of subpar holes takes one out of the lead quickly. A great player cannot take down a weaker player, except psychologically, because he doesn't directly play his competition. So a leser player on a great day has a chance beat anyone. Thus golf leads to a multiplicity of winners over a season. Unless you are Jack Nicklaus or Tiger Woods. The statistics for those two are so far superior to others that it makes moot the argument over who ae the greatest golfers.