What are the results in 2008 when 2009 is 0, and the ATP Tournaments Won is the tournament?
CREATE TABLE "singles_performance_timeline" (
  "tournament" text,
  "2003" text,
  "2004" text,
  "2005" text,
  "2006" text,
  "2007" text,
  "2008" text,
  "2009" text,
  "2010" text,
  "2011" text,
  "2012" text
);
SELECT "2008" FROM "singles_performance_timeline" WHERE "2009"='0' AND "tournament"='atp tournaments won';