CREATE TABLE table_45861 ("Outcome" TEXT, "Year" FLOAT, "Championship" TEXT, "Surface" TEXT, "Partner" TEXT, "Opponents in the final" TEXT, "Score in the final" TEXT)

What was the surface played on when they were a runner-up in 2007?
SELECT "Surface" FROM table_45861 WHERE "Outcome" = 'runner-up' AND "Year" = '2007'
SELECT "Surface" FROM "table_45861" WHERE "Outcome" = 'runner-up' AND "Year" = '2007'