How many times is player Stanislas Wawrinka on the list?
CREATE TABLE "men_s_singles" (
  "sd" real,
  "rk" real,
  "player" text,
  "points" real,
  "points_defending" real,
  "points_won" real,
  "new_points" real,
  "status" text
);
SELECT COUNT("points_defending") FROM "men_s_singles" WHERE "player"='Stanislas Wawrinka';