CREATE TABLE table_name_51 (opponent VARCHAR, tournament VARCHAR, surface VARCHAR, outcome VARCHAR)

Which Opponent has a Surface of hardcourt, an Outcome of runner-up, and a Tournament of honolulu?
SELECT opponent FROM table_name_51 WHERE surface = "hardcourt" AND outcome = "runner-up" AND tournament = "honolulu"
SELECT "opponent" FROM "table_name_51" WHERE "hardcourt" = "surface" AND "honolulu" = "tournament" AND "outcome" = "runner-up"