CREATE TABLE table_203_364 (id DECIMAL, "year" DECIMAL, "driver" TEXT, "nation of citizenship" TEXT, "racing series" TEXT, "type of vehicle" TEXT)

out of these drivers : nigel mansell , al unser , jr. , michael schumacher , and jeff gordon , all but one has more than one espy award . who only has one espy award ?
SELECT "driver" FROM table_203_364 WHERE "driver" IN ('nigel mansell', 'al unser, jr', 'michael schumacher', 'jeff gordon') GROUP BY "driver" HAVING COUNT(*) = 1
SELECT "driver" FROM "table_203_364" WHERE "driver" IN ('nigel mansell', 'al unser, jr', 'michael schumacher', 'jeff gordon') GROUP BY "driver" HAVING COUNT(*) = 1