What is Tournament, when 2001 is "1R"?
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 "tournament" FROM "grand_slam_singles_performance_timeline" WHERE "2001"='1r';