Madrid (Stuttgart) tournament with a 1996 of A has this for a Career SR?
CREATE TABLE "doubles_performance_timeline" (
  "tournament" text,
  "1990" text,
  "1991" text,
  "1992" text,
  "1993" text,
  "1994" text,
  "1995" text,
  "1996" text,
  "1997" text,
  "1998" text,
  "career_sr" text,
  "career_win_loss" text
);
SELECT "career_sr" FROM "doubles_performance_timeline" WHERE "1996"='a' AND "tournament"='madrid (stuttgart)';