CREATE TABLE table_66426 ("Outcome" TEXT, "Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Opponent" TEXT, "Score" TEXT)

When was the score 3-6 4-6?
SELECT "Date" FROM table_66426 WHERE "Score" = '3-6 4-6'
SELECT "Date" FROM "table_66426" WHERE "Score" = '3-6 4-6'