What is 2001, when 1994 is "A", and when Tournament is "Monte Carlo Masters"?
CREATE TABLE "singles_performance_timeline" (
  "tournament" text,
  "1992" text,
  "1993" text,
  "1994" text,
  "1995" text,
  "1996" text,
  "1997" text,
  "1998" text,
  "1999" text,
  "2000" text,
  "2001" text,
  "2002" text,
  "2003" text,
  "career_sr" text,
  "career_win_loss" text
);
SELECT "2001" FROM "singles_performance_timeline" WHERE "1994"='a' AND "tournament"='monte carlo masters';