CREATE TABLE table_13673 ("Outcome" TEXT, "Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Opponent" TEXT, "Score" TEXT)

What is the date when the tournament is san diego and the opponent is ann grossman?
SELECT "Date" FROM table_13673 WHERE "Tournament" = 'san diego' AND "Opponent" = 'ann grossman'
SELECT "Date" FROM "table_13673" WHERE "Opponent" = 'ann grossman' AND "Tournament" = 'san diego'