What is Career Win-Loss, when 2002 is "A", and when 2001 is "4R"?
CREATE TABLE "grand_slam_singles_performance_timeline" (
  "tournament" text,
  "2000" text,
  "2001" text,
  "2002" text,
  "2003" text,
  "2004" text,
  "2005" text,
  "career_sr" text,
  "career_win_loss" text
);
SELECT "career_win_loss" FROM "grand_slam_singles_performance_timeline" WHERE "2002"='a' AND "2001"='4r';