What is the average Top-10, when Wins is less than 0?
CREATE TABLE "summary" (
  "tournament" text,
  "wins" real,
  "top_5" real,
  "top_10" real,
  "top_25" real,
  "events" real,
  "cuts_made" real
);
SELECT AVG("top_10") FROM "summary" WHERE "wins"<0;