CREATE TABLE table_20109 ("Outcome" CLOB, "Year" FLOAT, "Championship" CLOB, "Surface" CLOB, "Partner" CLOB, "Opponents" CLOB, "Score" CLOB)

Name the surfaace where outcome is runner-up and championship is us open
SELECT "Surface" FROM table_20109 WHERE "Outcome" = 'Runner-up' AND "Championship" = 'US Open'
SELECT "Surface" FROM "table_20109" WHERE "Championship" = 'US Open' AND "Outcome" = 'Runner-up'