Which 2008 has a 2002 of a, and a Tournament of australian open?
CREATE TABLE "grand_slam_tournament_performance_timeli" (
  "tournament" text,
  "2002" text,
  "2003" text,
  "2004" text,
  "2005" text,
  "2006" text,
  "2007" text,
  "2008" text,
  "2009" text,
  "2010" text,
  "2011" text,
  "2012" text,
  "win_pct" text
);
SELECT "2008" FROM "grand_slam_tournament_performance_timeli" WHERE "2002"='a' AND "tournament"='australian open';