CREATE TABLE table_name_91 (date VARCHAR, outcome VARCHAR, opponent VARCHAR)

What is Date, when Outcome is 'Runner Up', and when Opponent is 'Lu Jiaxiang'?
SELECT date FROM table_name_91 WHERE outcome = "runner up" AND opponent = "lu jiaxiang"
SELECT "date" FROM "table_name_91" WHERE "lu jiaxiang" = "opponent" AND "outcome" = "runner up"