CREATE TABLE table_name_11 (score VARCHAR, surface VARCHAR, date VARCHAR)

What was Olga Govortsova's score when she played on a clay surface on 19 May 2008?
SELECT score FROM table_name_11 WHERE surface = "clay" AND date = "19 may 2008"
SELECT "score" FROM "table_name_11" WHERE "19 may 2008" = "date" AND "clay" = "surface"