CREATE TABLE table_5731 ("Name" TEXT, "Position" TEXT, "Height" TEXT, "Weight" FLOAT, "Year" TEXT, "Home Town" TEXT)

What year is guard Mario Chalmers?
SELECT "Year" FROM table_5731 WHERE "Position" = 'guard' AND "Name" = 'mario chalmers'
SELECT "Year" FROM "table_5731" WHERE "Name" = 'mario chalmers' AND "Position" = 'guard'