What is the 2007 value for the 2010 wta premier 5 tournaments?
CREATE TABLE "singles_performance_timeline" (
  "tournament" text,
  "2002" text,
  "2003" text,
  "2004" text,
  "2005" text,
  "2006" text,
  "2007" text,
  "2008" text,
  "2009" text,
  "2010" text,
  "career_sr" text,
  "career_w_l" text
);
SELECT "2007" FROM "singles_performance_timeline" WHERE "2010"='wta premier 5 tournaments';