What 2007 has wimbledon as the tournament?
CREATE TABLE "singles_performance_timeline" (
  "tournament" text,
  "2004" text,
  "2005" text,
  "2006" text,
  "2007" text,
  "2008" text,
  "2009" text,
  "2010" text,
  "2011" text
);
SELECT "2007" FROM "singles_performance_timeline" WHERE "tournament"='wimbledon';