Who is greater between the two? In terms of tennis statistics and their overall impact on the sport? Maria has 4 slams to Novak's 6, but Maria has the career slam. Both have been to #1, though Novak has had more time there. Both wins 95% of the time (ish) but loses more often than not to fellow top players. Pros for Novak: More weeks at #1, and 2 YE #1. Pros for Maria: much higher endorsement value and household name, and let's face it, more tennis and non-tennis fans alike would watch her match just to look at her, very few would watch Novak aside from his tennis. (In the general media, vagina > penis, and Maria is a looker). It's easy to see who is more marketable: So what do you think?