CREATE TABLE table_30910 ("Round" FLOAT, "Date" TEXT, "Opponent" TEXT, "Home/Away" TEXT, "Score  ( Collingwoods score is in bold ) " TEXT, "Result  ( includes margin ) " TEXT, "Venue" TEXT, "Position on Ladder" TEXT)

What is the round number of the round against melbourne on saturday, 4 april 2:10pm?
SELECT MIN("Round") FROM table_30910 WHERE "Opponent" = 'Melbourne' AND "Date" = 'Saturday, 4 April 2:10pm'
SELECT MIN("Round") FROM "table_30910" WHERE "Date" = 'Saturday, 4 April 2:10pm' AND "Opponent" = 'Melbourne'