What is the maximum total wins he had for any year? 
CREATE TABLE "atp_tour_career_earnings" (
  "year" real,
  "majors" real,
  "atp_wins" real,
  "total_wins" real,
  "earnings" real,
  "money_list_rank" real
);
SELECT MAX("total_wins") FROM "atp_tour_career_earnings";