CREATE TABLE table_11509 ("Res." TEXT, "Record" TEXT, "Opponent" TEXT, "Method" TEXT, "Event" TEXT, "Round" FLOAT, "Location" TEXT)

What is the highest round in the Wec 25 match in Las Vegas, Nevada, United States?
SELECT MAX("Round") FROM table_11509 WHERE "Location" = 'las vegas, nevada, united states' AND "Event" = 'wec 25'
SELECT MAX("Round") FROM "table_11509" WHERE "Event" = 'wec 25' AND "Location" = 'las vegas, nevada, united states'