CREATE TABLE table_79028 ("Outcome" TEXT, "Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Opponent" TEXT, "Score" TEXT)

What is the surface of the tournament with a runner-up outcome and dudi sela as the opponent?
SELECT "Surface" FROM table_79028 WHERE "Outcome" = 'runner-up' AND "Opponent" = 'dudi sela'
SELECT "Surface" FROM "table_79028" WHERE "Opponent" = 'dudi sela' AND "Outcome" = 'runner-up'