Chatter about the rankings in tennis generally focuses on the smallest numbers. That was the case last week, when Aryna Sabalenka overtook Iga Swiatek for the top spot in the WTA rankings for the second time in her career. Neither player should expect much change in her day-to-day existence or quality of life. Setting aside the bonuses that some players may receive from sponsors for finishing the season in the top 10 or the top 20, at this time of year the most meaningful ranking races involve t