What is the round number of the round against melbourne on saturday, 4 april 2:10pm?
CREATE TABLE "regular_home_and_away_season" (
  "round" real,
  "date" text,
  "opponent" text,
  "home_away" text,
  "score_collingwoods_score_is_in_bold" text,
  "result_includes_margin" text,
  "venue" text,
  "position_on_ladder" text
);
SELECT MIN("round") FROM "regular_home_and_away_season" WHERE "opponent"='Melbourne' AND "date"='Saturday, 4 April 2:10pm';