Which Career Win-Loss has a 2001 of 1–1?
CREATE TABLE "doubles_performance_timeline" (
  "tournament" text,
  "2001" text,
  "2002" text,
  "2003" text,
  "2004" text,
  "2005" text,
  "2006" text,
  "2007" text,
  "2008" text,
  "2009" text,
  "2011" text,
  "2012" text,
  "2013" text,
  "career_sr" text,
  "career_win_loss" text
);
SELECT "career_win_loss" FROM "doubles_performance_timeline" WHERE "2001"='1–1';